No, they're not. The #FediBlock hashtag can be used by anyone - it's literally just a hashtag - and it's up to folks (mainly admins) monitoring that hashtag to

No, they're not. The #FediBlock hashtag can be used by anyone - it's literally just a hashtag - and it's up to folks (mainly admins) monitoring that hashtag to investigate and (if it appears to be necessary) take action. There are no global blocklists, and even the concept of shared blocklists isn't accepted by many, although there are quite a few Known Bad instances that a lot of admins block.