Modular Regulatory Design for Platform Governance

Detailed Explanation with At Least 6 Case Laws

1. Introduction

Modular regulatory design for platform governance is an approach in which the regulation of digital platforms is divided into distinct but coordinated legal modules. Each module addresses a particular regulatory problem, such as competition, consumer protection, privacy, algorithmic transparency, interoperability, cybersecurity, content moderation, or accountability.

Rather than relying on a single comprehensive law to govern every aspect of a digital platform, modular regulation combines different statutory obligations, regulatory institutions, technical standards, and enforcement procedures.

This approach is increasingly important because modern platforms are not merely websites or intermediaries. They may simultaneously operate app stores, payment systems, advertising exchanges, cloud infrastructure, AI services, marketplaces, and communication networks. A platform's conduct can therefore raise several legal issues at once.

For example, a dominant mobile operating system may restrict third-party app distribution, collect extensive user data, determine payment conditions, and privilege its own applications. Competition law, privacy law, consumer law, and digital-market regulation may each address a different aspect of that conduct.

The central objective is to create a flexible, coordinated, and proportionate regulatory architecture that can respond to technological change without sacrificing legal certainty, due process, or fundamental rights.

2. Meaning and essential characteristics

Modular regulatory design has five principal characteristics.

Functional separation: Different regulatory modules address different risks, such as market power, data misuse, discrimination, and security.

Interoperability: The modules exchange information and coordinate enforcement rather than operating in isolation.

Proportionality: Obligations are tailored to a platform's size, market position, systemic importance, and specific risks.

Adaptability: Individual modules can be amended as technologies and business models evolve, without rewriting the entire regulatory system.

Accountability: Regulators must explain their decisions, respect procedural safeguards, and provide appropriate avenues of appeal.

The modular approach does not necessarily require separate statutes or separate regulators. A single digital-markets statute may contain multiple modules, while several existing laws may collectively perform the same function.

3. Legal framework for modular platform governance

A. Competition law module

This module addresses abuse of dominance, exclusionary conduct, anticompetitive agreements, self-preferencing, tying, exclusive dealing, and mergers that threaten future competition.

Its purpose is to ensure that platforms cannot use control over one market to restrict competition in adjacent markets. Competition law generally evaluates market definition, market power, competitive effects, objective justifications, and available remedies.

Relevant legal frameworks include:

United Kingdom: Competition Act 1998, particularly Chapter II, and the Digital Markets, Competition and Consumers Act 2024.

European Union: Articles 101 and 102 TFEU and the Digital Markets Act (DMA).

Germany: Gesetz gegen Wettbewerbsbeschränkungen (GWB), including §19a on certain conduct by undertakings of paramount significance for competition across markets.

United States: Sherman Act §§1–2 and Clayton Act merger provisions.

India: Competition Act 2002, including Sections 3, 4, 5 and 6, as applicable.

The module must distinguish unlawful exclusion from legitimate product integration, innovation, and efficiency. Interoperability mandates, for example, should be designed to remedy demonstrable competitive barriers without unnecessarily compromising security.

B. Data protection and privacy module

This module regulates the collection, combination, processing, sharing, and retention of personal data.

Its objectives include lawful processing, purpose limitation, transparency, data minimisation, user rights, and appropriate safeguards against intrusive profiling.

Important legal instruments include the EU General Data Protection Regulation (GDPR), the UK GDPR and Data Protection Act 2018, and India's Digital Personal Data Protection Act 2023, subject to the applicable commencement and implementation provisions.

A platform may possess substantial market power while also processing personal data unlawfully. These are distinct legal questions, even where the same conduct raises both competition and privacy concerns.

Modular design principle: Competition authorities should assess exclusionary effects and market power, while data protection authorities assess compliance with data protection requirements. They should coordinate where their investigations overlap, without treating a finding under one legal regime as automatically establishing a violation under the other.

C. Consumer protection and interface-design module

This module addresses misleading interfaces, hidden charges, manipulative choice architecture, deceptive subscriptions, fake reviews, and obstacles to cancellation.

It asks whether users receive accurate information and can make meaningful choices. It also considers whether a platform's design undermines consent or exploits information asymmetry.

Regulatory tools may include disclosure requirements, restrictions on deceptive practices, accessible cancellation mechanisms, refund obligations, and orders requiring interface redesign.

D. Interoperability and access module

This module governs access to interfaces, application programming interfaces (APIs), data portability, messaging networks, payment infrastructure, and other essential technical functions.

Interoperability can reduce switching costs and allow new entrants to compete. However, a general obligation to share every resource would risk undermining intellectual property, privacy, security, and incentives to innovate.

A sound module should specify:

The platforms and services subject to access duties.

Which interfaces or functions must be interoperable.

Technical standards and implementation deadlines.

Objective security and privacy exceptions.

Non-discrimination requirements and dispute-resolution procedures.

E. Algorithmic accountability module

Platforms increasingly use algorithms to rank content, recommend products, determine prices, moderate communications, allocate advertising, and detect fraud.

This module requires appropriate documentation, risk assessment, testing, and auditability. Where decisions significantly affect individuals, applicable law may also require explanations, human intervention, or avenues to contest decisions.

The regulatory design should differentiate ordinary automated ranking from high-impact or systemic uses. It should also protect confidential business information while giving regulators enough access to test for discriminatory effects, self-preferencing, manipulation, and coordinated anticompetitive behaviour.

F. Content governance and fundamental-rights module

This module regulates platform content policies, illegal-content procedures, account restrictions, appeals, transparency, and systemic risks.

In the EU, the Digital Services Act (DSA) establishes obligations for intermediary services, with additional duties for very large online platforms and search engines. The UK Online Safety Act 2023 establishes a separate statutory framework for specified online safety duties.

The module should balance public safety and protection from illegal content with freedom of expression, privacy, and procedural fairness. A platform's private terms of service do not displace applicable statutory obligations.

G. Cybersecurity and systemic-resilience module

This module addresses service outages, cyberattacks, supply-chain dependencies, unauthorised access, and failures in critical digital infrastructure.

It may require incident reporting, resilience testing, access controls, contingency planning, and secure-by-design development. These obligations should be coordinated with competition and interoperability requirements so that security is neither neglected nor used as an unsupported justification for excluding competitors.

4. Architecture of a modular regulatory system

Core governance layer

Risk classification · jurisdiction · proportionality · due process

Competition

Market power, exclusion, mergers

Privacy and data

Processing, consent, data rights

Consumer protection

Fair choice, disclosure, redress

Interoperability

Access, portability, standards

Algorithmic oversight

Audits, testing, explainability

Safety and resilience

Content risks, cybersecurity

Coordination and review layer

Shared evidence · consistent remedies · independent appeals · periodic reassessment

The architecture illustrates a key distinction: the modules are specialised, but their operation must be coordinated. A common governance layer determines which obligations apply, while a coordination layer reduces inconsistent decisions and overlapping remedies.

5. At least 6 important case laws

The following cases establish principles relevant to modular platform regulation. They do not all directly concern a statute expressly called a modular regulatory framework; rather, they illustrate the legal problems that such a framework must resolve.

Case 1: Google Shopping — European Union

Case: Google and Alphabet v Commission, Case C-48/22 P (2024).

Legal principle: Abuse of dominance, self-preferencing, and equal competitive opportunity.

The litigation arose from Google's treatment of its comparison-shopping service in general search results. The European Commission found that Google had favoured its own comparison-shopping service and disadvantaged competing services. The Court of Justice dismissed Google's appeal in 2024, upholding the relevant finding of abuse.

Relevance to modular regulation:

The competition module must assess discriminatory ranking and exclusionary platform conduct.

A transparency module can address the disclosure of ranking criteria.

A consumer module can consider whether users are misled about the neutrality of results.

Remedies should be coordinated to avoid imposing inconsistent technical requirements.

The case demonstrates that a platform's control over a central distribution channel can affect competition in adjacent markets.

Case 2: Google Android — European Union

Case: Google and Alphabet v Commission, Case T-604/18 (General Court, 2022).

Legal principle: Abuse of dominance through contractual restrictions and tying.

The General Court largely upheld the Commission's findings concerning Google's Android practices, including certain pre-installation and anti-fragmentation restrictions. It reduced the fine, but maintained the essential finding of infringement.

Relevance to modular regulation:

The case illustrates why mobile ecosystems may require separate but coordinated rules for operating-system access, application distribution, default settings, and competitive neutrality. A competition remedy might prohibit exclusionary contractual conditions, while an interoperability module may address technical barriers that remain after those conditions are removed.

The case also highlights the importance of distinguishing legitimate system integrity and security requirements from restrictions that unjustifiably limit competition.

Case 3: United States v Microsoft — United States

Case: United States v Microsoft Corp., 253 F.3d 34 (D.C. Cir. 2001).

Legal principle: Monopolisation, exclusionary conduct, and the protection of competition in software ecosystems.

The US Court of Appeals upheld important findings that Microsoft had unlawfully maintained its operating-system monopoly through exclusionary conduct involving browser competition. It also addressed the legal treatment of tying and the limits of the remedies ordered by the lower court.

Relevance to modular regulation:

Microsoft demonstrates that control of a foundational technological layer can influence competition in neighbouring markets. It supports a regulatory structure that separately evaluates:

Market power at the infrastructure layer.

Restrictions on downstream applications.

Contractual and technical exclusion.

The proportionality of structural or behavioural remedies.

The case also warns against assuming that every integrated product is unlawful. The legal assessment must focus on the conduct, evidence, competitive effects, and applicable legal test.

Case 4: Apple v Epic Games — United States

Case: Epic Games, Inc. v Apple Inc., 67 F.4th 946 (9th Cir. 2023).

Legal principle: App-store governance, distribution restrictions, and platform payment rules.

Epic challenged Apple's app distribution and payment restrictions. The Ninth Circuit largely affirmed the district court's judgment, including the rejection of Epic's federal antitrust claims and the finding of a violation of California's unfair competition law concerning certain anti-steering restrictions.

Relevance to modular regulation:

The dispute demonstrates that app-store governance combines several regulatory concerns: market access, payment rules, contractual freedom, consumer choice, and developer dependence.

A modular framework can assess these issues separately rather than assuming that a finding under consumer or unfair-competition law automatically establishes an antitrust violation. It can also design remedies directed at specific restrictions, while considering platform security and payment-system integrity.

Case 5: Bundeskartellamt v Facebook (Meta) — Germany

Case: Bundeskartellamt v Facebook, Case C-252/21, Court of Justice of the European Union (2023).

Legal principle: Data protection, market dominance, and coordination between competition and privacy law.

The case concerned the German competition authority's treatment of Facebook's extensive collection and combination of user data. The Court of Justice clarified that a competition authority may examine whether data-processing practices comply with the GDPR when this is necessary to assess abuse of dominance, while respecting the competence and cooperation requirements applicable to data protection authorities.

The judgment did not establish that every GDPR infringement constitutes an abuse of dominance.

Relevance to modular regulation:

This is a particularly strong example of why modularity requires coordination. Competition authorities may need to understand data-processing practices, but should not replace specialist data protection authorities.

A coordinated system should provide for evidence sharing, consultation, consistent legal reasoning, and respect for each regulator's statutory powers.

Case 6: Schrems II — European Union

Case: Data Protection Commissioner v Facebook Ireland Ltd and Maximillian Schrems, Case C-311/18 (2020).

Legal principle: Fundamental rights, international data transfers, and effective safeguards.

The Court of Justice invalidated the EU–US Privacy Shield adequacy decision and upheld the validity of standard contractual clauses subject to conditions, including the need to assess whether protection in the destination country is essentially equivalent and to adopt supplementary measures where required.

Relevance to modular regulation:

A platform's operations may depend on global cloud infrastructure, advertising networks, and cross-border data flows. This case demonstrates that technical and commercial efficiency cannot displace legal safeguards governing personal data.

The data protection module must therefore remain effective even where compliance intersects with cloud procurement, platform competition, and international technology supply chains.

Case 7: Glawischnig-Piesczek v Facebook Ireland — European Union

Case: Eva Glawischnig-Piesczek v Facebook Ireland Ltd, Case C-18/18 (2019).

Legal principle: Injunctions against unlawful online content and the territorial scope of intermediary obligations.

The Court of Justice considered whether an injunction could require a hosting provider to remove or block identical and, in certain circumstances, equivalent unlawful content, including beyond the territory of the Member State concerned, subject to applicable international law.

Relevance to modular regulation:

Content governance requires rules on the identification of unlawful material, the scope of removal orders, technical implementation, and territorial reach. These matters should be coordinated with freedom of expression, procedural safeguards, and the legal limits on cross-border enforcement.

The case illustrates why content regulation needs its own legal module rather than being treated solely as a competition or consumer-protection question.

Case 8: Meta Platforms Inc. v Bundeskartellamt — European Union

Case: Meta Platforms Inc. v Bundeskartellamt, Case C-252/21 (2023).

This is the same judgment discussed in Case 5, so it should not be counted as a separate authority. For an additional and distinct example, consider the following case.

Case 8: L'Oréal v eBay — European Union

Case: L'Oréal SA v eBay International AG, Case C-324/09 (2011).

Legal principle: Online marketplace responsibility and the limits of intermediary protections.

The Court of Justice examined the application of EU trade mark law and intermediary liability to online marketplace activity. It considered circumstances in which a marketplace operator's role may go beyond that of a neutral intermediary and the availability of injunctions against intermediary services.

Relevance to modular regulation:

A marketplace may be subject to different obligations depending on whether it acts as a passive intermediary, actively promotes listings, controls transaction design, or engages in its own commercial conduct.

Modular regulation should therefore classify the platform's functions and allocate responsibilities accordingly, rather than treating all platform activities as legally identical.

Case 9: NetChoice, LLC v. Paxton — United States

Case: NetChoice, LLC v. Paxton, 603 U.S. 707 (2024).

Legal principle: Platform content moderation and freedom of expression.

The US Supreme Court considered constitutional challenges to Texas and Florida laws regulating the content-moderation practices of major social-media platforms. It held that the lower courts had not adequately assessed the facial First Amendment challenges and remanded the cases for further analysis. The Court explained that some platform-curation activities may constitute protected expressive activity, depending on the function and context.

Relevance to modular regulation:

A platform-governance framework must distinguish economic regulation from regulation that affects editorial judgment or expressive activity. Interoperability, transparency, and consumer-protection obligations should be designed with appropriate constitutional safeguards.

Case 10: United States v Google LLC — United States

Case: United States v Google LLC, No. 1:20-cv-03010 (D.D.C., liability judgment, 2024).

Legal principle: Monopolisation in general search services and search text advertising.

The US District Court for the District of Columbia found that Google had unlawfully maintained monopolies in general search services and general search text advertising through exclusionary distribution agreements.

Relevance to modular regulation:

The case illustrates how control over distribution channels, default placement, and access to users can reinforce market power. A modular framework can coordinate competition enforcement with rules governing default settings, consumer choice, distribution agreements, and access to competing services.

The case also demonstrates the importance of tailoring remedies to the source of the competitive harm rather than automatically imposing the same remedy on every platform.

6. Comparative regulatory models

These systems illustrate different ways of allocating regulatory responsibilities. The precise duties, jurisdictional thresholds, commencement dates, and enforcement powers vary. Modular regulation is not a uniform international legal doctrine.

7. Advantages of modular regulatory design

A. Greater adaptability

Technological systems evolve more quickly than comprehensive legislative codes. Modular rules can be updated for new risks, such as AI agents, algorithmic pricing, cloud concentration, and model-to-model interoperability, without redesigning the entire governance structure.

B. Specialised expertise

Competition authorities, data protection regulators, consumer agencies, and cybersecurity bodies possess different forms of expertise. Modular design allows each institution to focus on its core responsibilities while coordinating with other regulators.

C. Proportionate obligations

Not every digital service creates the same level of risk. A small specialist marketplace should not automatically face the same obligations as a dominant operating system or a systemic social network.

Regulators can differentiate requirements according to market power, the number and dependence of users and business customers, the sensitivity of processed data, and the consequences of service failure.

D. More targeted remedies

Where a specific practice causes harm, regulators can focus on the relevant module. For example, a competition authority might prohibit discriminatory access terms, while a data protection authority addresses unlawful data combination.

Targeted remedies may reduce unnecessary interference with unrelated platform functions.

8. Risks and limitations

Regulatory fragmentation: Different authorities may reach inconsistent conclusions about the same technical practice.

Duplicative compliance: A platform may have to prepare multiple reports, audits, and risk assessments that substantially overlap.

Regulatory arbitrage: Companies may restructure services or contracts to exploit gaps between statutory regimes.

Overlapping remedies: A competition remedy might require data access while a privacy obligation restricts disclosure. Neither obligation should be implemented without resolving the legal and technical conflict.

Capture and dependency: Regulators may become dependent on the platforms they supervise for technical information, audit tools, or access to proprietary systems.

Excessive rigidity: Detailed technical mandates can become obsolete and inadvertently favour established firms that can afford compliance.

The appropriate response is not to abandon modularity, but to strengthen coordination, common definitions, transparent procedures, and periodic review.

9. A proposed implementation framework

A practical modular framework can be developed in six stages.

Identify the regulated functions. Separate hosting, search, app distribution, payments, advertising, cloud services, AI deployment, and other relevant activities.

Classify the risks. Assess market power, user dependence, data sensitivity, systemic effects, and potential harm to fundamental rights.

Allocate legal responsibilities. Identify the relevant statutes, lead regulators, supporting regulators, and applicable jurisdictional thresholds.

Define technical obligations. Establish measurable standards for interoperability, data protection, audits, disclosures, incident reporting, and access where justified.

Coordinate enforcement. Create consultation procedures, lawful evidence-sharing arrangements, lead-authority mechanisms, and a process for resolving conflicts between proposed remedies.

Review outcomes. Monitor entry, switching costs, innovation, compliance costs, privacy, security, and unintended effects. Revise modules when the evidence warrants it.

10. Hypothetical application

Suppose a dominant mobile platform integrates an AI assistant into its operating system. The assistant receives privileged access to user data, favours the platform's own services, restricts competing assistants from using certain APIs, and controls the default interface for payments.

A modular framework would analyse the situation as follows:

The same conduct can trigger several modules, but each regulator must establish the elements of the applicable legal rule. A privacy violation does not automatically establish dominance abuse, and market dominance does not automatically justify unrestricted API access.

11. Conclusion

Modular regulatory design offers a structured response to the complexity of digital-platform governance. Its central strength lies in combining specialised legal rules with coordinated enforcement, proportionate obligations, and periodic review.

The cases discussed above demonstrate recurring challenges: self-preferencing, ecosystem foreclosure, app-store restrictions, data concentration, intermediary responsibility, content moderation, and cross-border governance. They provide judicial principles for designing individual modules, even though they do not establish a single universal doctrine of modular regulation.

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