No single person will ever willingly consent to having their personal photos used to benefit a money grabbing company like Meta, or any company for that matter.
I'm pretty against big money-grabbing companies as you put it, but I'm happy to license all my photos, code, and art with public domain licenses, even if it benefits those companies. Because I think it's the right thing to do. Ultimately, companies use copyright as a weapon to oppress the speech and learning of regular folk.
If some kid who's trying to learn coding sees a function I wrote, they should be able to copy it wholesale if it pleases them to do so. If somebody in school is learning to make hobby games while they're supposed to be doing homework, they should be able to take a bunch of sprites from nintendo games and make the story about spider-man if they want to. they should be able to share that game with other people, and even sell it.
If meta uses artifacts I create to train their AI, that's a small price to pay for doing what's right for people who are just trying to learn and express themselves naturally.
Personally, I am happy EU and Brazil put brakes on this because Meta deserves to learn a lesson about forced consent. That is not an okay thing to do.
Instead of earning goodwill, and actually represent open source and the wider community - they simply assumed that consent is a given.
If they had forced everyone in an unavoidable consent form when visiting Facebook/Instagram, the results would be completely different.
They knew this.