And we do if you try to buy porn in a bookstore. We still don't like upending the entire framework of the Internet for the sake of replicating that online. Which is exactly what's happening here. The loot box thing is an afterthought that mandates a specific age rating for games that include them and nothing else. Porn is the main focus of the legislation.

And I disagree on implementing internet-wide ID checks for the sake of keeping kids away from porn. Hard.

The UK has challenge 25 laws that mean that you only need to show ID if you look like you're under 25. So no you don't always need to provide ID to purchase alcohol, at least not in puritan shitholes.