That’s not what the poster is talking about. Whether the piracy subreddit or the lemmy community, there are strict rules about sharing copyrighted content, asking for it or posting links to it. These communities are about discussing different technologies around BitTorrent, usenet or debrid and how to leverage them to share content.

All of the above can be used for perfectly legal reasons such as sharing Linux ISOs or public domain media.

If you use those to pirate copyrighted content that’s your decision.

Calling these communities illegal and blocking them is akin to schools not permitting students to use backpacks or lockers because they could be used to hide guns.