It seems counter-intuitive to moderate based on "which server user is from" too.
it sounds like the exact answer to me.
just like massive chunks of our infrastructure blacklists entire domains because their admins are overly friendly to ddos, spam, illegal porn, etc… mastodon simply makes it easy to do the same thing.
this isn’t new, our entire internet runs on this principle.
the difference between centralized social like twitter/facebook and this is, the choice is ours to make. if we don’t like how a server is run, move or spin up our own. we curate it, not advertisers, not executive boards, not faceless shareholders, etc…
with decentralized, freedom of speech and more importantly, freedom of association is back in our hands again.
There are Mastodon servers that exist for things that most people don't want to interact with, such as racist hate speech, as well as servers that are essentially unmoderated. It makes sense for a server with a mainstream audience to block those.