Very soon, the domain of bullshit will extend to actual text. We'll be able to buy HN comments by the thousand -- expertly wordsmithed, lucid AI comments -- and you can get them to say "this GitHub repo is the best", or "this startup is the real deal". Won't that be fun?
Phone, then ID-based verification is a stop gap, but IDV services will have to spin up to support the mass volume of verifying all humans.
[1] I kind of want to do this from an innocent / artistic perspective myself. Perhaps a bot that responds with a bunch of rhetorical questions or onomatopoeia. Then I'd scale it to the point people start noticing and feeling weirded out by it. "Is this the new Gen Alpha lingo?" Alas, I have too many other AI projects.