I spent $10 once to promote my page. I never considered that it would result in some type of Facebook fraud. I had hoped to get a few LIKEs. I probably got 20 new likes from it or so. My page engagement did not go up. I always wondered if it was worth promoting the page.
This Veritasium video is the necessary analysis everyone using Facebook needs to see. It turns out that buying Facebook ads legally from Facebook does not isolate you from Facebook fraud. Watch the video below. It will be enlightening.