I think you’re totally misunderstanding how decentralization works. It sounds like you think it should be a free for all and everyone should be free to access everything. But again, the fediverse is about choice. It’s totally okay for an admin to be able to cut off another instance. It’s their instance, that’s up to them. Nobody wants absolute free speech.

If you don’t like that, go to another instance that doesn’t do that and if you get cut off from another instance by another admin, maybe consider joining that instance or another instance that isn’t defederated.

And consider also that this power is great motivation for everyone to stay nice and well moderated. If you are mean or spammy or whatever, you get defederated. So you better be nice! That’s a great feature if you ask me.