Earlier quoted context omitted.
We can't prevent all children from getting beer, but we can prevent most of them without compromising any adult's privacy. And everyone is ok with that state of affairs and the trade-offs. No one's calling for internet-connected beer cans that make you take a selfie before you can open them. https://news.ycombinator.com/item?id=46447282
> we can prevent most of them without compromising any adult's privacy But we don't. Even with in person age/ID checks the clerk will often enter some of that data into the store's system and then who knows what happens with it.
I've only seen them enter the date of birth. No identifying information. If they record the ID itself I'd recommend going to a different store. Or ideally, writing your legislators to have the practice banned.