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.
100,000 suing for $10,000 each is $1 billion.