"Defederation was never meant to be used as a tool to oppress opinions and blackmail instance owners, but this is what it is now used for. "

This is why you say no to the people behind blocklists. Don't let them blackmail you or decide which instances you block. You don't need them to be safe on fedi, they need you to keep their blocklist important especially if they want to show their instance/side of the fediverse as popular.

It is better to block on an individual basis as you go than to outsource it to anyone else.