KYC != decentralized identities. I have never heard of anyone working on an actually-decentralized system capable of proving that you are Fred, as opposed to me

KYC != decentralized identities. I have never heard of anyone working on an actually-decentralized system capable of proving that you are Fred, as opposed to merely rate limiting the speed at which you can create accounts (which one might argue is sufficient, but isn't KYC). It might be that you are merely misusing the term, and meant something like sybil-resistant pseudonyms?