It already is, you just have to convince the server owner whats 'extreme' or not. Some servers hate liberals, others hate the right, some are followers of the windmill party and others would get you on a watchlist.

And the more mundane stuff like having porn and gore posts not tagged as NSFW will get your instance defederated.

What we actually need is better mod tools

no thank you

(Edit!: can't you just block users who you don't like what they have to say no matter how mild?)

I don't see why a couple of peeps other users get offended by because they have a different opinion but aren't bein outright harming/threatening/other Xtreme actions, should lead to those peeps' instances being blocked and or defederated. looks so pathetically bad when that happens and can also turn off new users