Slowly facebook is learning that it needs to show me pictures of my friend's kids - even friends are rarely interact with though. Mostly because I've blocked everything else the algorithm might show me.
You seem to be misunderstanding Facebook's goals. They don't care about showing you pictures of your friend's kids. They are using your friend's content to dangle a carrot in front of you to keep you clicking on what they want you to click on. If you've stopped clicking on ads and promoted posts, it's because they haven't yet learned what they need to show to you keep you clicking, but they will! They're dedicating all of their engineering efforts to keep people clicking.
Every 20th post or so, someone would be saying something like "Stop it you idiots, this stupid copy-paste doesn't do anything, you can't declare your rights like this." Then a bunch more copy-paste comments would appear before the next person telling the idiots to stop.
I don't mean that as a snarky dismissal, but a sincere question. I know that plenty of people, especially among digital-natives, have instant negative reactions to being reminded of data collection. But the type of user answering "what was your first car" or "what do you call your grandchildren" do not strike me as having much overlap with the groups that are cynical about social media platforms.
Another thing to do is to tell people "they're trying to use this information to get into your bank account". That will make them stop really fast. But as far as scalability goes, I don't think there's a way.
If we all agree (and I mean, a large number of people) to fully quit Facebook; or at the very least - report and block every single one of these sites and postings, I think that would be a great deterrent.