alt Hacker NewsThis was largely the reason I rejected "real name verification" ideas at GitHub after the xz attack. (Especially if they are state sponsored) it's not that hard for a dedicated actor (which xz certainly was) to get a quality stolen identity.
The inevitable evolution of such a feature is a button on your repo saying" block all contributors from China, Russia, and N other countries". I personally think that's the antithesis of OSS and therefore couldn't find the value in such a thing.
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.