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[1]: Tangentially, those are trivially circumvented in many countries. When I was a teenager in St. Petersburg, we’ve used a “duty free delivery service”, which (I suppose) just stocked liquor at the duty free shop on the border with Finland, and then sold it. Not sure how legal was the core premise (probably not), but we used it because their couriers didn’t even pretend they need to check our passports (definitely illegal).
In many countries, alcohol is available in grocery delivery services. Couriers happily leave your order at the doorstep even though they are supposed to check your ID. In many other countries, even buying in-store is possible (e.g. Japan, where in any konbini you can just press a button on screen saying “yes, I’m 21”).