The Nazi instance that got blocked literally had something adjacent to “nazi” in their url. Fairly clear decision if you ask me. This was a few months ago so I don’t recall the actual server name without digging it up.

Then there was the Hexbear fiasco, where they decided to federate with us (apparently they have it set up for admins to opt-in to federation instead of opt-out). They ended up swarming all of our communities for 4-5 days with nonstop harassment. Then their admins decided to re-defederate before we could vote on whether to block them. Literally a “you can’t fire me, I quit!” scenario.