Worldcoin’s approach to digital identity based on biometric scanning and strict one-ID-per-person rules is cited by Vitalik Buterin as a model that could undermine user autonomy and increase coercion risk despite ZK protections.

Quotes that support claims

Even with ZK proofs, Buterin argues that coercion remains a risk, especially if governments or employers demand users link activity to their verified ID, as could happen with projects like Worldcoin.

World, formerly Worldcoin, which uses biometrics for verification and zero knowledge proofs for privacy, recently passed 10 million users.