If anything I'd be shocked if they didn't sell the data of those who paid. If you pay for Facebook you have more money than you know what to do with, the list of users who do so are the Glengarry leads that every sales org would desparately want.
None of the major ad tech companies “sell your data”. They sell access to you based on the data that they have. The data they have on you is much too valuable to sell.
This is correct. They give your data for free to a group of advertisers and let them bid on who will pay the most to show you an ad.
They do no such thing. The advertisers never have your data. The advertisers tell Facebook which demographic they want to target and Facebook obliges.
Wasn't Meta the company that started using 2-factor phone numbers for targets of advertisements?