The notion that you should upload a passport to random sites for age verification is unbelievably dangerous. That's a recipe for identity theft. And face scanning is also an invasion of privacy, not to mention very unreliable (my 16 year old son has apparently been accepted as 20 years old).
I've pointed out in many places already that the only way to do online age verification right, is for the government to provide an e-ID that the random site will direct you to with the question "is this person older than X?", then you log in to the e-ID site, which informs you exactly what the site wants to know (which should be as rough as possible; no birthdate), then the e-ID site directs you back to your original site (or possibly through a proxy, if you don't want the government to know what sites you visit), and calls their webhook (through a proxy) with the confirmation of your age.
That's also how my online payments work, and this should be the standard pattern for everything that needs to be secure. Not sharing sensitive or personal data with random sites.