The Maze: Europe’s platform rulebook is entering its less glamorous phase: the part where policy becomes operating system. Booking.com, Zalando, and Idealo have warned that the EU’s digital rules risk becoming too complex and disproportionate to manage. The complaint is not only about Brussels paperwork. It is about the product, data, seller, risk, and governance systems that commerce platforms now need to run while still serving travelers, merchants, brands, and shoppers.
The stack is no longer one regulation. The Digital Services Act covers online marketplaces, app stores, social networks, and online travel/accommodation platforms used by EU citizens. For marketplaces, that means duties around seller traceability, illegal-goods reporting, and platform accountability. For very large online platforms, it adds systemic-risk assessments and mitigation duties. The Digital Markets Act then adds a different logic for gatekeepers: contestability, business-user data access, limits on self-preferencing, anti-steering constraints, and rules on contracts outside the platform. These are not abstract legal categories. They touch ranking, ads, seller onboarding, fraud controls, product data, checkout, and partner access.
Commerce platforms are directly inside the large-platform layer. The Commission’s DSA supervision list names Booking.com and Zalando as very large online platforms. Booking.com is listed above the 45 million monthly EU-user threshold, while Zalando is listed at 83.7 million average monthly active users. Both have also faced formal information requests under the DSA supervision process. That matters because ecommerce and travel operators are not being regulated only as retailers or intermediaries. They are being treated as systemic digital infrastructure, with obligations closer to the largest online platforms.
Booking.com now carries an extra gatekeeper burden. The Commission designated Booking as a Digital Markets Act gatekeeper for its online intermediation service in May 2024. That makes the compliance map more layered: DSA duties for platform safety and transparency, DMA duties for market contestability, and still more consumer and fairness obligations around how users buy, cancel, compare, or contract online. The commercial issue is not whether Booking.com can hire lawyers. It is whether the resulting controls can be embedded into product workflows without slowing every seller, hotel, campaign, and customer journey.
The Digital Fairness Act is the next pressure point. The MLex summary flags the expected Digital Fairness Act as another addition to the rule stack, and the Commission’s official initiative path already exists. The exact final scope still matters. But the direction is clear: Europe is moving from platform conduct rules into consumer-interface fairness. That brings compliance closer to checkout design, cancellation flows, subscriptions, personalization, dark-pattern controls, and how platforms present choice. For a marketplace, those are not legal footnotes. They are conversion mechanics.
Why it matters: Compliance is becoming platform infrastructure. The winners will not be the firms with the loudest Brussels objections. They will be the ones that turn overlapping rules into repeatable systems: product controls, seller governance, audit trails, risk dashboards, data-access workflows, and policy operations that can scale across markets. The danger for operators is not one regulation. It is death by interface review, exception handling, and duplicated governance layers. Europe wants safer, fairer digital markets. Platforms now have to prove they can build that without making commerce slower, less flexible, and more expensive.
