This is one of the fundamental problems of the

Fediverse/ActivityPub model, where your chosen instance is the

arbitrator of what you see.

In comparison,

even if the operator of a big Nostr relay bans/blocks an account, users

who follow that account can still see their stuff because they're

generally connected to multiple relays at the same time.

On

top of that, even if every relay in my list blocks an account I follow,

NIP-65 makes it so that my client will find which relays that account

posts to and pull in their content. Only I get to choose who is blocked

from my feed, not the relays.