I just read up on the recent issue between mastodon.social and social.targaryen.house, over m.s "silencing" s.t.h to handle a bad user, H5N10, when s.t.h admin didn't appear sufficiently responsive.
Pretty detailed thread, rehashing details and arguments, at https://ika.moe/@Naouak/778172
This might end in a long-term split between tightly-policed instances (green zone) and anything-goes instances (red zone). But who controls the policing? It risks being collective punishment.