All libp2p messages are E2E encrypted between peers, which means your ISP or people on your network don't know you're using plebbit, dont know what your plebbit author is or what subs you're reading. All plebbit publications are E2E encrypted between you and the sub owner, so other plebbit peers cannot link your IP with your plebbit author. Other plebbit peers know your IP is reading a specific sub though. And through heuristics, they might be able to guess that your IP is linked to a specific plebbit author. To gather these heuristics, you'd have to build some custom libp2p/plebbit node and run it 24/7 and personally interact will all plebbit peers in existence, it would be extremely complicated and costly, so obviously nobody is doing it now, but when plebbit is popular, law enforcement will do it for sure. So you shouldnt do illegal stuff on plebbit, you're not fully anonymous. Deanonymizing users is difficult enough and costly enough that nobody will do it just because they dont like your shitpost. Law enforcement will do it for sure if you're doing something extremely illegal that they care about. You can solve this by using a VPN or Tor.