Facebook doesn't make its money from advertisers.

If you follow the ownersship, the same groups owns Coka-epsi as owns CNN as owns F-c-book. So, advertising revenue is just them paying themselves.

These owners are only interested in one thing. Control.
(They own the printing presses, so, what do they care about money?)

They want to keep your eyeballs affixed firmly to their propaganda.

They have always collected all the data they could get. They have never followed "the law". They do not believe in privacy. How much privacy would you consider appropriate for a cow?

Unfortunately for them, f-c-book and other platforms gave the ability for everyone to talk to everyone, and thus secrets become harder to hide.