Are you absolutely sure about this? They suspended access to, and later restored access to, 3 piracy related communities a few months ago because they weren't sure what their legal liability was. And being as instances are owned by individuals without access to teams of high priced legal teams, that seemed fair enough to me.
Also, .world servers are not in the US so why do you imagine any US law would be enforced there?
There's absolutely no mention of any of this on their Announcement community either.