Yeah, the Fediverse is pretty much designed to be able to handle stuff like this. They just get their own Instances, and anyone who does not wish to see that content can defederate with them.

You can't keep anyone, at all, not porn, not Zuckerberg, not Nazis, nobody, off the Fediverse. It's actually impossible. All you can do is defederate the things you do not wish to associate with.

This is a non-issue, and hand-wringing about it is largely pointless. If you want to talk about the rightness of defederating different platforms, that's a different story. But that's also up to the communities of each individual Instance.