I'm struggling to think of any online services for which I'd be willing to verify my identity or age

https://lemmus.org/post/20594088

IMO steam does a reasonable job of age verification - if you’ve registered a credit card, you’re obviously old enough to have one.
But they still ask for my DoB when I open a store page for a horror game.
1/1/00 baby!

1/1/however far back the wheel scrolls before I click the year.

And it’s distressingly common for it to under-report my age.