Was that not the case with AOL in the US in decades past?
Facebook might be one of the few organizations with the motivation and ability to set up two different regimes to contain the effects of GDPR on their practices.
In that case, I would love to know what their selection criteria is.
>  I want to see dancing monkeys and for that, I agree to have all my data shared with unnamed third and fourth parties indefinitely.
See? Everyone clicked that :).
It would be different if you had to pay for something, in which case you would have to agree to share your name, credit card etc. However, they still would not be allowed to share it with unrelated (!) third parties.