The admins of lemmy.world have blocked 3 or 4 of the main piracy communities out of fear of getting caught in a legal crossfire, since by nature of the federated network, contents from those communities would be copied over to their servers, making them potentially liable for hosting content in violation of European laws.

Here's a bit of a summary and discussion: https://sh.itjust.works/post/2882678

Hosters are fully registered and are reactive to claims, not like some overseas server farms operating under Seychelles law etc.