This blog post by Ploum, who was part of the original XMPP efforts long ago, describes how Google killed one great federated service, which shows why the Fediverse must not give Meta the chance
4 points
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The only official way is for the admin of your instance to defederate from the instance you want blocked, but that affects every registered user on your instance, even if they’re against the action.
I just released a user script that lets you block instances yourself on the client-side as a regular user - basically just removes post and comments from the HTML if they match your block list.
