I mean, doesn’t somebody still need to validate that those keys only get to people over 18? Either you have a decentralized authority that’s more easily corrupted or subverted or else you have the same privacy concerns at certificate issuance rather than at time of site access.
AI could be a viable test for bullshit jobs as described by Graeber. If the disinfotmatron can effectively do your job then doing it well clearly doesn’t matter to anyone.