Yes. The endgame is going to be everything will need to be signed and attached to a real person.

This is not a good thing.

Why not? I kinda like the idea of PGP signing parties among humans.

Lookup the number of people the British (not Chinese or Russian but the UK) government has put in jail for posting opinions and memes the politicians don't like. Then think about what the combination of no anonymous posting and jailing for opinions the government doesn't like means for society.

I don’t love the idea of completely abandoning anonymity or how easily it can empower mass surveillance. Although this may be a lost cause.

Maybe there’s a hybrid. You create the ability to sign things when it matters (PRs, important forms, etc) and just let most forums degrade into robots insulting each other.

Surely there exists a protocol that would allow to prove that someone is human without revealing the identity?

Because this is the first glimpse of a world where anyone can start a large, programmatic smear campaign about you complete with deepfakes, messages to everyone you know, a detailed confession impersonating you, and leaked personal data, optimized to cause maximum distress.

If we know who they are they can face consequences or at least be discredited.

This thread has as argument going about who controlled the agent which is unsolvable. In this case, it’s just not that important. But it’s really easy to see this get bad.

In the end it comes down to human behavior given some incentives.

if there are no stakes, the system will be gamed frequently. If there are stakes it will be gamed by parties willing to risk the costs (criminals for example).

For certain values of "prove", yes. They range from dystopian (give Scam Altman your retina scans) to unworkably idealist (everyone starts using PGP) with everything in between.

I am currently working on a "high assurance of humanity" protocol.