What do I think about biometric proof of personhood?

Proof of personhood aims to tie each registered account to a unique real human, and biometric versions such as Worldcoin's iris-scanning Orb raise tradeoffs that must be weighed against social-graph approaches or giving up on proof of personhood entirely. Worldcoin, co-founded by Sam Altman, scans each user's iris with the Orb and stores only hashes of the scans to check uniqueness. The text lists four major risks for Worldcoin's design: privacy, accessibility, centralization through possible Orb backdoors, and security issues such as hacked phones or 3D-printed fake people.