Don't get me wrong, I'm all for privacy. But between setting up the birthdate when creating my children's local account on their computers, and having to send a copy of their ID to every platform under the sun, I'd easily chose the former.
I'd even agree to a simple protocol (HTTP X-Over-18 / X-Over-21 headers?) to that.
Nice to see lots of downvotes for stating factually correct statements while the parent post is literally all conjecture based on "well they would do that wouldnt they?" but is upvoted.
If they were planning on doing ID verification for this why would they take this half step? It doesnt make it easier for them down the road, if anything it makes it harder as there's the ability to say "but we already have that". If the plan was to mandate face ID why wouldnt they just go straight for that like the UK and Australia have for porn?