See longer post (not by me) there, if all is true then they should fall under both the spam and mass lemm.ee rule breaking defederation rules, both bigotry and abusive language, though not always in combination.
Also the covenant thing Mastodon has would probably be a good idea.
They initially allowed the_donald, and they only removed the community after receiving significant backlash from other instances
I think they may also not heavily vet registrations, but perhaps you could correct me if I’m wrong about this
One dude makes a community doesn’t mean the instance platforms Nazis. Let’s not spread lies now. Just gonna add the discussion link here
They platformed the community, so it is not lying to say they supported Nazis since that is literally what they did