Competition Law and Digital Competition Reforms

1. Introduction

Digital markets have fundamentally changed the way competition law operates. Traditional competition law was largely designed around price, output, market shares, physical assets and conventional barriers to entry. Digital markets, by contrast, frequently involve:

zero-price services;

massive data accumulation;

network effects;

multi-sided platforms;

algorithms and artificial intelligence;

self-preferencing;

app-store restrictions;

interoperability problems;

switching costs and customer lock-in;

ecosystems spanning several related markets; and

acquisitions of emerging competitors before they become significant threats.

These characteristics have exposed limitations in relying exclusively on conventional ex post antitrust enforcement under provisions dealing with abuse of dominance, restrictive agreements and merger control.

Digital competition reforms therefore increasingly combine:

traditional competition law;

ex ante obligations for powerful digital platforms;

special merger-control rules;

data-access and interoperability obligations;

platform neutrality requirements;

consumer-choice requirements; and

stronger regulatory powers and remedies.

The European Union's Digital Markets Act (DMA), the UK's Digital Markets, Competition and Consumers Act 2024 (DMCC Act), reforms and proposals in Australia, India and other jurisdictions illustrate this transition. The EU has designated major firms including Alphabet, Amazon, Apple, ByteDance, Meta and Microsoft as gatekeepers, with additional designations subsequently made for Apple/iPadOS and Booking.com. (Digital Markets Act (DMA))

2. Why Traditional Competition Law Is Difficult to Apply to Digital Markets

A. Price is no longer an adequate indicator of competitive harm

Many digital services are provided to consumers for zero monetary price.

Examples include:

search engines;

social-media platforms;

messaging applications;

email services; and

video-sharing platforms.

The consumer may pay with:

personal data;

attention;

behavioural information;

advertising exposure; and

engagement.

Consequently, a traditional test such as:

"Has the dominant firm increased prices?"

may produce an incomplete answer.

A platform may maintain a zero monetary price while simultaneously:

reducing privacy;

degrading quality;

increasing advertising;

restricting interoperability; or

weakening consumer choice.

Digital competition reforms therefore increasingly recognise non-price parameters of competition.

3. Data as a Source of Market Power

Data can create competitive advantages through:

1. Scale

A large platform can collect enormous quantities of behavioural information.

2. Scope

Data collected from one service can improve another service.

For example:

Search data → advertising optimisation → better targeting → more advertisers → more revenue → more investment → more users.

3. Feedback loops

The more users a platform has, the more data it can collect.

The additional data can improve algorithms, which attracts more users.

This produces a data-network effect.

4. Barriers to entry

A new entrant may possess superior technology but lack sufficient data to compete effectively.

5. Artificial intelligence

The importance of data has become even greater with AI systems because training, fine-tuning and evaluating models can require enormous datasets and computing resources.

Therefore, modern competition law increasingly considers:

data + computing infrastructure + algorithms + network effects

as interconnected sources of market power.

4. Network Effects

Digital platforms frequently exhibit direct and indirect network effects.

Direct network effect

The value of a platform increases as more users join.

Example:

A messaging service becomes more useful when more of a user's contacts use it.

Indirect network effect

More users attract sellers, advertisers or developers, which in turn makes the platform more attractive to users.

For example:

More users → more merchants → more product choice → more users.

This can produce tipping.

Once a platform becomes sufficiently large, competitors may find it extremely difficult to attract users.

This is one reason why digital competition reforms seek to intervene before a market becomes irreversibly concentrated.

5. Gatekeeper Regulation

One of the most important reforms is the shift from asking only:

"Is the firm dominant?"

to asking:

"Does the firm control an important gateway through which businesses and consumers must interact?"

The EU's DMA is the leading example.

The DMA identifies certain powerful platforms as gatekeepers and imposes obligations on them without requiring the Commission to prove a conventional Article 102 TFEU abuse in every individual case.

The EU framework covers core platform services such as:

search engines;

online marketplaces;

app stores;

operating systems;

advertising services;

social networks;

video-sharing platforms;

browsers; and

messaging services. (Digital Markets Act (DMA))

This represents a fundamental philosophical change.

Traditional model

Market power → investigation → infringement → remedy

Digital regulation model

Gatekeeper status → predefined obligations → continuous compliance → enforcement

6. Major Digital Competition Reforms

A. European Union – Digital Markets Act

The Digital Markets Act (DMA) is perhaps the clearest example of modern ex ante competition regulation.

It seeks to make digital markets:

fairer;

more contestable;

less dependent upon dominant platforms; and

more open to competitors.

The six original gatekeepers were:

Alphabet;

Amazon;

Apple;

ByteDance;

Meta; and

Microsoft. (Digital Markets Act (DMA))

The Commission subsequently designated additional services, including Apple's iPadOS and Booking.com's online intermediation service. (Digital Markets Act (DMA))

7. Anti-Self-Preferencing Rules

Self-preferencing occurs when a platform favours its own products or services over competing products.

For example:

A search platform operates both a search engine and a comparison-shopping service and gives its own comparison service preferential placement.

The concern is that the platform acts simultaneously as:

infrastructure provider;

marketplace operator; and

competitor.

This creates an inherent conflict of interest.

Digital competition reforms therefore seek to restrict discriminatory treatment and self-preferencing.

8. App Store Regulation

App stores are particularly important because the platform operator may control:

distribution;

payment systems;

ranking;

access to consumers;

commissions;

technical standards; and

developer relationships.

The platform may therefore act as both:

gatekeeper + competitor

Digital reforms address this through requirements concerning:

alternative payment systems;

steering;

alternative distribution;

interoperability;

fair access; and

restrictions on discriminatory treatment.

The EU Commission, for example, opened DMA proceedings concerning Apple's App Store and Alphabet's Google Play rules, including whether developers could effectively steer users toward alternative offers. (Digital Markets Act (DMA))

In April 2025, the Commission found Apple in breach of the DMA's anti-steering obligation and imposed a €500 million fine. (Digital Strategy)

9. Interoperability

Interoperability means that competing services can technically interact with an established platform.

This is especially important in:

messaging;

operating systems;

cloud services;

payments;

digital identity;

IoT ecosystems.

Without interoperability, users can become locked into an ecosystem.

For example:

Users remain on Platform A because their contacts, applications, data and devices are all connected to Platform A.

A competitor may therefore have difficulty competing even if its product is technologically superior.

10. Data Portability

Data portability enables users to transfer information from one platform to another.

Its competition objective is to reduce:

switching costs + lock-in

For example, if a consumer can easily transfer:

contacts;

photographs;

playlists;

purchase history; or

other relevant information,

moving to a competing service becomes easier.

Data portability can therefore function as a contestability remedy.

11. Restrictions on Combining Data

Digital platforms may obtain information from several services.

Suppose one company operates:

social media;

messaging;

advertising;

payment;

e-commerce; and

video services.

Combining information across these services can create a significant competitive advantage.

The DMA therefore regulates certain forms of personal-data combination.

Meta's "consent or pay" model became a major example. In 2025, the Commission found Meta's model non-compliant because it did not provide the required equivalent less-personalised alternative. (Digital Strategy)

This demonstrates an important development:

Data governance and competition law are increasingly interconnected.

12. Merger-Control Reform

Traditional merger control often focuses on:

turnover;

market shares;

concentration;

barriers to entry; and

likely price effects.

These criteria can be inadequate for digital acquisitions.

A start-up may have:

very low turnover;

rapidly increasing users;

valuable technology;

proprietary datasets; and

substantial innovation potential.

Therefore:

low turnover ≠ low competitive significance

Digital competition reforms increasingly scrutinise acquisitions of potential competitors.

This is sometimes described as the problem of "killer acquisitions."

13. Killer Acquisitions

A dominant digital company may acquire a start-up not because the start-up is currently a major competitor but because it could become one.

The transaction may eliminate:

future innovation;

disruptive technology;

alternative business models; or

a potential competitor.

The competition authority must therefore consider:

Counterfactual question

What would the target company have become if the acquisition had not occurred?

This requires greater attention to:

innovation;

potential competition;

pipeline products;

user growth;

technological capabilities; and

future market development.

14. Algorithms and Competition Law

Algorithms create new forms of competition risk.

They can facilitate:

algorithmic collusion;

personalised pricing;

discriminatory ranking;

self-preferencing;

exclusion;

dynamic pricing; and

manipulation of search results.

The difficulty is that unlawful coordination may occur without direct human communication.

For example:

Competitors use pricing algorithms that automatically respond to one another.

The result may be supra-competitive prices even without a conventional cartel meeting.

Competition law therefore increasingly examines:

algorithmic conduct + data + platform design

rather than merely traditional agreements.

15. Six Major Case Laws

Case 1: Google Shopping – Google Search (Shopping)

Case: Google Search (Shopping), European Commission, Case AT.39740

This is one of the most important digital competition cases.

Facts

Google operated a general search engine while also operating its own comparison-shopping service.

The Commission found that Google systematically gave its comparison-shopping service prominent positioning while rival comparison-shopping services were demoted.

Competition issue

The conduct was characterised as self-preferencing.

Google was simultaneously:

operating the search infrastructure; and

competing with businesses dependent upon that infrastructure.

Legal significance

The case demonstrated that dominance in an upstream platform can be used to distort competition in a related downstream market.

Importance for digital reforms

It helped establish the policy foundation for modern rules against:

platform neutrality violations and self-preferencing.

The subsequent DMA framework specifically addresses concerns of this type.

16. Case 2: Google Android

Case: Google Android, European Commission, Case AT.40099

Facts

Google imposed various contractual restrictions concerning Android devices, including requirements connected with the distribution of Google applications and services.

Competition concern

The Commission considered that Google's conduct could reinforce the position of Google Search and restrict competing search engines.

Digital competition significance

The case illustrated the importance of:

operating-system control;

default settings;

pre-installation;

distribution agreements; and

ecosystem effects.

A consumer may technically have a choice while the practical architecture of the device makes one option substantially easier to use.

This created the concept of choice architecture as a competition issue.

17. Case 3: Google AdSense

Case: Google AdSense for Search, European Commission, Case AT.40411

Google operated advertising intermediation services connecting advertisers and publishers.

The Commission examined contractual restrictions that prevented publishers from displaying competing search advertisements.

Competition significance

The case demonstrated how a platform can use contractual arrangements to protect an ecosystem from competitive pressure.

The broader lesson is:

Competition law must examine not only prices but also contractual architecture and distribution restrictions.

18. Case 4: Amazon Marketplace

Amazon provides an especially important example because it operates both:

a marketplace; and

its own retail business.

This creates a potential structural conflict.

Amazon can potentially access information concerning third-party sellers while simultaneously competing against those sellers.

The European Commission investigated Amazon's use of non-public seller data and ultimately accepted commitments addressing competition concerns.

Digital competition lesson

The case illustrates the danger of:

dual-role platforms

where the platform operator controls the infrastructure and competes against businesses using that infrastructure.

This issue is directly relevant to modern digital-market regulation.

19. Case 5: Apple App Store / Spotify

Case: Apple App Store Practices, including the Commission's investigation concerning music-streaming applications.

Apple's App Store rules restricted developers' ability to inform consumers about alternative purchasing possibilities.

Competition concern

The platform controlled:

distribution;

payment;

consumer access; and

commercial terms.

The resulting concern was that Apple could use its gatekeeper position to restrict competing services.

Significance

The case became an important precursor to the DMA's anti-steering rules.

The Commission's later DMA enforcement against Apple demonstrates how the legal approach moved from conventional antitrust enforcement toward ex ante regulation. (Digital Strategy)

20. Case 6: Meta – Facebook / Data Combination

Case: Bundeskartellamt v Facebook/Meta

The German competition authority examined Facebook's combination of user data obtained from Facebook and other sources.

Competition issue

The case demonstrated that exploitation of personal data can have a competition dimension where a dominant platform's market power enables it to impose data-related conditions on users.

Importance

It contributed to the emergence of the concept that:

privacy conditions can constitute a parameter of competition.

Competition is therefore not necessarily limited to monetary prices.

21. Case 7: Microsoft – Internet Explorer

Case: Microsoft, Case COMP/C-3/39.530

Microsoft's conduct concerning Internet Explorer is historically important for digital competition law.

Microsoft integrated its browser with Windows and was accused of restricting competition from rival browsers.

Significance

The case concerned:

tying;

operating-system dominance;

default settings;

distribution advantages; and

consumer choice.

It demonstrates that control over an operating system can provide a platform with enormous leverage over adjacent markets.

This principle remains highly relevant to modern ecosystems involving:

operating systems + browsers + search + applications + advertising.

22. Case 8: Microsoft – Windows Media Player

Case: Microsoft Corp. v Commission, Case T-201/04

The EU institutions examined Microsoft's tying of Windows Media Player with its dominant Windows operating system.

Legal significance

The case established important principles concerning:

leveraging;

tying;

interoperability;

dominant platforms; and

foreclosure of neighbouring markets.

It remains relevant to digital competition reforms because modern platform ecosystems frequently involve the same structural problem:

dominance in one technological layer can be leveraged into another.

23. Comparative Development of Digital Competition Law

24. United Kingdom – Digital Markets, Competition and Consumers Act 2024

The UK's DMCC Act 2024 represents another important model.

It created a specialised digital-markets regime administered by the Competition and Markets Authority.

The UK system focuses on firms designated as having Strategic Market Status (SMS) in relation to a particular digital activity.

The CMA's regime became operational from January 2025. (GOV.UK)

The framework permits the CMA to impose:

conduct requirements;

pro-competitive interventions;

merger-reporting requirements; and

enforcement measures.

The UK therefore follows a model similar in objective to the DMA but retains a more firm-specific and activity-specific regulatory structure.

25. EU–UK Comparison

European Union

The DMA generally operates through:

gatekeeper designation + statutory obligations

United Kingdom

The DMCC regime operates through:

Strategic Market Status + tailored conduct requirements

This distinction is significant.

The EU approach is more prescriptive.

The UK approach gives the competition authority greater scope to formulate obligations according to the circumstances of an individual firm and activity.

26. India and Digital Competition Reform

India has traditionally relied upon the Competition Act 2002, particularly:

Section 3 – anti-competitive agreements;

Section 4 – abuse of dominant position;

Sections 5 and 6 – combinations.

However, digital markets have raised difficulties concerning:

network effects;

data advantage;

platform ecosystems;

self-preferencing;

preferential ranking;

app-store restrictions;

deep discounting;

exclusive agreements;

interoperability; and

acquisitions of innovative start-ups.

The Competition Commission of India has consequently increasingly examined major digital platforms.

The proposed movement toward a more specialised digital competition framework reflects the recognition that conventional ex post enforcement may sometimes occur too late.

27. Ex Ante versus Ex Post Competition Law

This is the central conceptual distinction.

Ex post model

The authority waits for suspected anti-competitive conduct.

It then:

defines the market;

determines dominance;

identifies abusive conduct;

investigates effects; and

imposes remedies.

Advantage

It can avoid unnecessary regulation.

Disadvantage

By the time enforcement occurs, the market may already have tipped.

Ex ante model

The law identifies powerful platforms in advance and imposes behavioural obligations.

Advantage

It prevents anti-competitive conduct before it becomes entrenched.

Disadvantage

It can over-regulate legitimate innovation.

Therefore, digital competition reform attempts to strike a balance between:

contestability and innovation

28. The Concept of Contestability

Traditional competition law often asks:

"How competitive is the market?"

Digital regulation increasingly asks:

"Can competitors realistically enter and challenge the incumbent?"

A market may have several competitors on paper but still be effectively uncontestable because of:

network effects;

data advantages;

switching costs;

ecosystem integration;

technical incompatibility;

default settings;

exclusive contracts; and

access restrictions.

Therefore:

Contestability = ability of new or existing rivals to challenge market power.

This is one of the central objectives of modern digital competition regulation.

29. Self-Preferencing as a Regulatory Problem

A platform can potentially favour its own services through:

search ranking;

default placement;

algorithmic recommendations;

pricing;

commissions;

access to data;

technical integration;

interoperability restrictions.

For example:

Marketplace operator → owns marketplace → sells products itself → controls seller data → controls ranking algorithm.

This creates a structural conflict.

Digital competition reforms attempt to neutralise this conflict by requiring:

equal treatment;

transparency;

non-discrimination;

data separation; or

restrictions on self-preferencing.

30. Consumer Choice Architecture

Digital competition law is increasingly concerned with how choices are presented.

A platform may technically provide several choices but design the interface so that one choice is substantially easier.

Examples include:

pre-selected defaults;

difficult cancellation;

repeated consent prompts;

hidden alternative options;

complicated switching procedures;

prominent placement of the platform's own product.

Thus:

Formal choice ≠ effective choice.

Digital competition regulation therefore increasingly examines user-interface design as part of competitive conditions.

31. Cloud Computing and Digital Competition

Cloud infrastructure creates another emerging competition issue.

Major cloud providers can possess:

enormous capital resources;

extensive infrastructure;

proprietary ecosystems;

customer data;

software ecosystems; and

switching-cost advantages.

Potential concerns include:

cloud switching charges;

interoperability restrictions;

data portability;

technical lock-in;

preferential treatment of affiliated services;

tying cloud services to other products.

The European Commission has increasingly examined cloud infrastructure within its digital competition framework, including market investigations concerning major cloud providers. (Publications Office of the EU)

32. Artificial Intelligence and Competition Law

AI introduces several new competition concerns.

A. Data concentration

Large platforms may possess unique datasets.

B. Compute concentration

Advanced AI requires enormous computing capacity.

C. Model concentration

A small number of firms may control foundational models.

D. Distribution concentration

A dominant platform can integrate AI into:

search;

operating systems;

cloud;

office software;

advertising;

social networks.

E. Vertical integration

A company may control:

chips → cloud → model → application → distribution.

This creates potential for vertical foreclosure.

Digital competition law will therefore increasingly need to examine entire AI ecosystems rather than isolated products.

33. Digital Mergers and Innovation

Competition authorities must consider whether a transaction eliminates:

potential competition;

future innovation;

technological alternatives;

data competition; or

a future platform.

The appropriate counterfactual is not merely:

"Would prices increase?"

It may instead be:

"Would innovation, quality, privacy, technology or consumer choice have developed differently without the acquisition?"

This represents a major conceptual expansion of merger analysis.

34. Remedies in Digital Competition Cases

Traditional remedies may be insufficient.

Behavioural remedies

Examples:

non-discrimination;

data-access obligations;

interoperability;

prohibition of tying;

transparency;

anti-self-preferencing rules.

Structural remedies

Examples:

divestiture;

separation of business units;

prohibition of acquisitions;

functional separation.

Technical remedies

Examples:

APIs;

interoperability interfaces;

data portability;

technical access;

default-choice screens.

The choice of remedy is critical because a remedy that looks effective legally may be ineffective technologically.

35. Penalties and Systemic Remedies

Modern digital legislation increasingly provides stronger sanctions.

Under the DMA, for example, infringement can attract substantial turnover-based fines, with enhanced consequences for repeated violations and additional structural remedies for systematic infringements. (Digital Markets Act (DMA))

The underlying rationale is straightforward:

A fine must be large enough that a dominant platform cannot simply treat regulatory penalties as a cost of doing business.

36. The Most Important Policy Problems

Digital competition reforms nevertheless create difficult questions.

1. Over-regulation

Not every successful digital company is anti-competitive.

2. Innovation

Restrictions imposed on platforms can sometimes reduce incentives to innovate.

3. Regulatory uncertainty

Businesses need to know precisely what conduct is prohibited.

4. Global inconsistency

The EU, UK, US, India, Australia and other jurisdictions may adopt different standards.

5. Jurisdictional conflict

A multinational platform may face multiple regulators imposing different remedies.

6. Technological complexity

Competition authorities must understand:

algorithms;

APIs;

cloud systems;

AI models;

data architecture;

cybersecurity; and

platform economics.

37. Emerging Principle: Competition by Design

One of the most significant developments is the idea that platforms should incorporate competition considerations into the design of their services.

Instead of waiting for an abuse, regulation may require:

interoperability by design;

portability by design;

user choice by design;

non-discrimination by design;

compliance monitoring by design.

The DMA expressly adopts a strong compliance-by-design philosophy, requiring gatekeepers to adapt services so that compliance is maintained continuously. (Digital Markets Act (DMA))

38. Overall Legal Assessment

Digital competition reform represents a transition from:

"Punish abuse after it occurs"

toward:

"Prevent entrenched digital power from becoming unchallengeable."

The most important developments are therefore:

gatekeeper regulation;

ex ante obligations;

anti-self-preferencing rules;

interoperability requirements;

data portability;

restrictions on data combination;

app-store regulation;

greater scrutiny of digital mergers;

algorithmic competition oversight;

cloud and AI competition regulation;

stronger structural remedies; and

greater cooperation between competition and data regulators.

39. Conclusion

Competition law is undergoing a structural transformation because digital markets do not always behave like traditional markets.

The central problem is no longer simply:

"Does the dominant company charge excessive prices?"

It is increasingly:

"Does the platform possess such control over data, users, infrastructure, algorithms and distribution that competitors cannot realistically challenge it?"

The major digital cases involving Google, Microsoft, Amazon, Apple and Meta demonstrate the evolution of competition law from traditional concepts of tying and exclusion toward newer concepts such as self-preferencing, data-driven market power, ecosystem dominance, interoperability, platform neutrality and contestability.

The EU DMA and UK's DMCC regime demonstrate the movement toward ex ante digital competition regulation, while developments in India and other jurisdictions indicate a broader global reassessment of conventional antitrust tools.

Ultimately, the objective of digital competition reform is not to punish successful technology companies merely for being large. It is to ensure that:

scale does not become an irreversible barrier to entry, data does not become an unassailable competitive moat, platforms do not exploit their gatekeeper position to disadvantage rivals, and digital markets remain contestable, innovative and fair.