That would be easily defeated by a VPN. The inevitable evolution would be some kind of in-person attestation of identity backed up with some kind of insurance on the contributor's work, and, well you're converging on the employer-employee relationship then.

Yep, I saw the cat and mouse ending at ever increasingly invasive verifications involving more parties, that could ultimately still be worked around by a state actor. We already get asked for "block access from these country ip ranges please" as a security measure despite it being trivially bypassed, so it is easy to predict a useless but strong demand for blocking users based on their verified country.