I hate this analogy because it isn't true. This isn't like a clerk checking your age before you buy booze this is like a clerk taking a photocopy of your ID and a list of everything you bought and then storing those records forever every time you buy alcohol.
Most stores already have continuously-recording CCTV, which effectively does that too.
At least online there can be a separation between the age verification provider and the online content provider, so that the latter doesn't learn anything from the former except that the user's age is above or below a specific cut-off point. So it can actually be more privacy-preserving than purchasing age-restricted goods over the counter.
they literally do that though. They don't all just look at your ID any more, some scan it with a scanner or phone and that literally does what you just said. Paying with a card also does it.
No it's like the publisher of the adult content magazine being liable if an underage person buys the magazine. And due to burden of proof they require all stores that sell their magazine to make a copy of your ID and send it to them along with a recording of you providing the ID at the counter, some stores may require your address, iris or fingerprint scan.
Actually not to them through them to one of the few ID verifier 3rd parties that now receives a big portion of the records of anyone that buys adult content in any store with any publisher.