> The point is that there shouldn't be any "the" machine for users to get locked into as a chokepoint. If you want to block someone, you block them, or delegate it to someone in a way that you can later change at no switching cost to yourself.

Why would you force the provider to support objectionable (for them) content? It makes sense for the instance to be aligned with its users on moderation rules.

> The benefit, and goal, of federation here should be to make the hosting node a fungible commodity.

Communities aren't fungible! And your insistence on having federation completely seamless will result in "what's the point anyway, let's centralize it, more efficient"