It's not a high risk, but it's a thing the author said that's wrong, which puts into question the rest.
You still didn't explain how it would happen. It would require a person making accounts with the same (anonymous) email on multiple age-restricted websites the day of their 18th birthday... and you'd need to have access to all these separate services... then you could guess this person recently turned 18, and still you wouldn't know who this person is.
for example some people find ways to consume alcohol or buy it before they're the legal age... So it is wrong to say that nobody objects
No shit. The point is that we recognise these age checks as legitimate and reasonable in the real world.
> To prove to a porn site ... I should not have to hand over my name, date of birth...
Note that with the proposed mechanism you're not handing over your date of birth. You'd at least need to create multiple accounts with the same identity on multiple age-restricted websites and temporally close enough, and these websites should be sharing and crossing the data. For the first years this would be absolutely useless in any case because of the amount of people of all ages registering. In the worst scenario, you'd be assuming that any anonymous that registered within a few days on two different age-restricted service has just turned 18- which might apply to anyone choosing a new fake email or changing browser.
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You still didn't explain how it would happen. It would require a person making accounts with the same (anonymous) email on multiple age-restricted websites the day of their 18th birthday... and you'd need to have access to all these separate services... then you could guess this person recently turned 18, and still you wouldn't know who this person is.
No shit. The point is that we recognise these age checks as legitimate and reasonable in the real world.
Note that with the proposed mechanism you're not handing over your date of birth. You'd at least need to create multiple accounts with the same identity on multiple age-restricted websites and temporally close enough, and these websites should be sharing and crossing the data. For the first years this would be absolutely useless in any case because of the amount of people of all ages registering. In the worst scenario, you'd be assuming that any anonymous that registered within a few days on two different age-restricted service has just turned 18- which might apply to anyone choosing a new fake email or changing browser.