Bluesky’s separation of moderation from hosting does reduce the chance of that pretty substantially. Unlike mastodon, where everyone is constantly screaming for servers to block each other, users can opt to do so without the operator taking that decision. Sure, the operator could as well, but the fact that they don’t have to (even if they think the content is objectionable) is pretty important imo. But the only thing that sets nostr apart here is that clients connect to multiple servers. That’s….a very simple feature to add to any social protocol? They could just add that and be done with it and then we’d have nothing. Not sure they will, but…