>>106299404
Nothing, that's why the age check is valid for a maximum of 3 months. Nothing stops people from selling alcohol or porn to kids either. And some people are going to do it for sure. These laws are never about making sure absolutely no kid gets their hands on this stuff. But to make sure the majority don't.
>>106299408
This is /g/, you should be aware how zero-knowledge proofs work.
>>106299468
It's true. You're right in that selling the data doesn't matter. What matter is what you do with the cookies. If they're required for the functionality of the site, like login cookies, etc. you don't need the popup. If you've got any tracking cookies of any kind you need the banner. Basically if you only had the cookies you'd have when clicking the decline all/only required button on the popup you don't need the popup.
It's not a lie and you can check it yourself. Again, the EU age verification isn't based on showing your ID to the website. And to prevent abuse of selling the certificates or accounts they require re-checking periodically.