This is explained on [this support answer](https://support.google.com/youtube/answer/95725)
It's a thing on Revanced YT even if spoofing an old version. [Applies to the web version](https://lemm.ee/post/4504173) as well now
This seems to be due to some [new EU law](https://fry.gs/post/5061) ?
Is that just based on a picture of someone’s face?
How about https://thispersondoesnotexist.com ?