Hard to get 10 million to dump. Having 200,000 sue could force changes and/or take the company down.
Facebook gets its money because people pay Facebook to run their ads. Many people do not run ads, but some pay quite a bit to run them, this cost can be as little as 10 dollars for booster ads to much, much, more. If you don’t run ads on Facebook, you are not a significant revenue stream for them and they won’t mind kicking you off. If it’s someone who regularly pays thousands of dollars monthly to advertise their company, that’s different.