https://www.techdirt.com/articles/20210624/02433247051/top-eu-court-rules-online-platforms-are-not-liable-copyright-infringements-user-uploads-unless-they-actively-intervene.shtml

One of the most contentious areas of Internet law is the extent to which sites are responsible for the actions of their users. One issue concerns user-uploaded materials: if these infringe on copyright, should the platform be held responsible too? The EU's highest court, the Court of Justice of the European Union (CJEU), has just ruled on two cases touching on this question. One concerned the posting of music recordings to YouTube, while the other involved medical textbooks published by Elsevier, which appeared on some filesharing sites. Both cases were before the Federal Court of Justice in Germany, which asked the CJEU to provide guidance on the liability of online platforms as regards to copyright materials posted by users. The basic decision is straightforward (pdf), explained here by the court's press release:

the Court emphasises the indispensable role played by the platform operator and the deliberate nature of its intervention. That platform operator makes an 'act of communication' when it intervenes, in full knowledge of the consequences of its action, to give its customers access to a protected work, particularly where, in the absence of that intervention, those customers would not, in principle, be able to enjoy the broadcast work.