you could sell physical items at any store where you have to show your ID and you get one for the age group you are.

that kills two birds with one stone, you can then show everywhere online you are human and how old you are without the services needing any personal information about you, and the sellers don't know what you use that id tag for.

People who are posting AI comments or setting up AI bots are... people. They can show their ID. If a website owner doesn't have a way to ban that specific human and the bad guy can always get another voucher, it's sort of meaningless.

In fact, even if you can ban the human for life, I'm not sure it solves anything. There are billions of people out there and there's money to be made by monetizing attention. AI-generated content is a way to do that, so there's plenty of takers who don't mind the risk of getting booted from some platform once in a blue moon if it makes them $5k/month without requiring any effort or skill.

Perhaps not only just show your id to get your "Over age X verification object", but your ID also gets irreversibly altered (like a punch card) that makes it one-time-use only.

That might make it less likely someone would ever sell it because to get a new one might take a very long "cool-down" time and it'd severely hamper the seller.

I'll sell you my proof-of-human-age badge for $1,000.

what’s to keep people from selling or giving away those id tags? seems like a nefarious entity could buy them in bulk

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