Yeah.

At present, most accounts are coming through the claims route, and so we know who the original marker sat with.

There are still multiple ways to pay for an account and be anonymous, or go through the Steemit inc sign up process (perhaps with a throw-away phone number), and I suspect these methods aren't going anywhere soon.

Sooo, at present, I have nothing with regards to a solution. Oracles were touted as being a step towards implying an account was 'good', but those are seemingly some way off yet.