I'm all for decentralized proofs-of-personhood. You go to some physical place, a human talks to you and says a magic phrase, you write that in your phone and perform a signature with your Nostr key using a special kind. That person then awards you with a badge that says you are really a human. No KYC involved. You can go back there the next day with a different key, but the person on the place will actually recognize you using their human recognition abilities and deny you a second badge.