One of the benefits of having these multiple instances is that each can set its own rules. For example, the main instance, mastodon.social, has a strict policy of no Nazis, no racism, no sexism, no xenophobia and no discrimination, which can be seen as a direct result of Twitter’s inability to handle harassment and abuse.
I have a problem with this kind of censorship as it solves nothing. The last thing we want to do is drive difference underground, hide it away where we can’t see it and pretend it’s not there or that it doesn’t exist. We need to see it to fight it.