It's up to each instance owner to decide how they run their instance, what the rules are, who gets to be in it and who they federate with.
If someone doesn't like it, they can go to another instance or set up their own.
That's how this place has always worked. That's the central theme of the the "what is mastodon?" intro video:
https://peertube.social/videos/watch/adffa7af-6063-4e09-8c1c-e8252167315d