Because what I'm getting at is Apple is already privacy focused. It would be entirely plausible to me that we end up in a situation where Apple's implementation of this is absolutely just "Yup, here's the token that proves I know this is an adult" and if doing that screws Meta's plans for advert-nirvana, I would expect them to take that route.
With the porn ban in the UK we have this worst of both worlds at the moment. We have forced ID verification by these creepy third parties, but it's so fragmented and localized that no big player like Apple is stepping in to provide anything more consumer friendly.