I seen what happened when they fled to mastodon after Elon took over and it was terrible. Block and censorship happy and they hated it even though it offers a better user experience and simplicity than nostr
Discussion
If there’s demand for that then someone will fork a client or build a client to serve that market. If a group of people want to have a moderator or to censure the ideas of others they will have to build their own client. It will probably happen.