Some issues:

× Nostr does seem to have shadowbans

× The protocol leaves a lot of basic functionality up to centralized servers, resulting in a lot of lock-in, e.g. Primal successfully taking the "my tribe" feed away leaving me unable to see posts from my followers because no other client seems to have a feed like that

× Zaps aren't actual Bitcoin transfers, they're more like IOUs

× Discussions on nostr still aren't authentic compared to what was possible on Aaron Swartz era reddit, or in afk interactions face to face for people who have avoided being ostracized in the modern era