Brazil's Supreme Court rewrites platform-liability rules affecting Reddit

On 26 June 2025 Brazil's Supreme Federal Court (Supremo Tribunal Federal, or STF) issued a landmark ruling holding Article 19 of the Marco Civil da Internet — Law No. 12.965/2014 — partially unconstitutional. Article 19 had established that internet application providers were generally liable for third-party content only after failing to comply with a specific court order to remove it. The STF's decision dismantled that court-order-only safe harbour for broad categories of harmful material, reshaping the legal environment for essentially all platforms operating in Brazil, including Reddit.

Under the new framework, platforms can face liability for certain categories of content without a prior judicial order, moving Brazil toward a notice-and-takedown and fault-based model. The categories singled out for stricter treatment included serious crimes and harms such as hate speech, incitement to violence, child sexual abuse material, terrorism, and certain forms of grave disinformation. For such content, a platform's failure to act after being notified — rather than only after a court order — could expose it to liability.

The ruling applied broadly to internet application providers generally rather than naming Reddit specifically. As one of many covered platforms, Reddit was swept into a regime that increased its potential exposure for user-generated content in Brazil and heightened the expectation that it would act on notifications of clearly unlawful material. Commentators also noted that the decision reinforced expectations that large platforms maintain a local legal representative or presence in Brazil to receive process and respond to demands.

The context mattered: Brazil had recently demonstrated, in its 2024 standoff with X (formerly Twitter), that its courts and regulators were willing to take aggressive action — including temporary nationwide blocking — against platforms seen as flouting local law. The STF's Marco Civil ruling was distinct from that episode but signalled a broader judicial willingness to expand platform accountability and to narrow the protections platforms had relied on for a decade.

For an archive of Reddit controversies, the significance is not that Reddit was a named party — it was not — but that a major democracy's highest court fundamentally altered the liability rules under which Reddit must operate in one of the world's largest internet markets. The decision was a binding ruling rather than a mere proposal, and it placed Brazil among the jurisdictions, alongside the European Union and others, steadily eroding the broad intermediary immunity that platforms such as Reddit had historically enjoyed.