I imagine most of the big servers have them blocked but it's probably the individual servers that make up the majority of the numbers. If you're self-hosting then you can just ignore instances you don't like and be relatively confident they won't hassle you. The other kind though, probably want to preempt them!

It is trivially easy to find examples of them wanting to nuke the US or kill all liberals or defending Soviet and Chinese pogroms, etc. I don't understand how that's really any different from saying "kill all Jews" or advocating for slavery tbh. As far as I can tell, the line exists because edgy redfash are mostly marginalized so nobody takes them seriously?