@dansup Rather than a central authority, couldn't it be possible to create a mutual certification? Each user would indicate which account they trust, and each user would see on an account whether there's a chain of trust from them to this account.
It's a bit like what LinkedIn does when they show how far someone is from you (direct connexion, connexion of a connexion or 3+), but with a voluntary step.

This would be closer to the decentralized philosophy of the fediverse.

But no way to monetize this.