I only see two outcomes for this problem : an internet of verified identities (start by uploading your ID card). Or a paid internet, where it doesn't matter who you are, but since you're going to pay for that email or that reddit account, the probability that it's AI spam is greatly reduced. And i'm looking forward to none of them.
Honestly the $10 barrier to SomethingAwful back in the day (and I guess now since it’s still around) definitely made a huge difference. I hate the idea of subscribing to a site like HN or Reddit… but one time $10 to post? I’d accept that if it meant less bots.
The bots exist for a reason, usually to covertly advertise a product, and by themselves already cost money to run. Someone looking to astroturf their AI B2B SaaS would probably be more willing to pay $10 to post than a random user from a less wealthy country who just wants to leave a comment on an interesting discussion.