This is really the chief danger here - it's the ability to retroactively label anything as predatory. You don't actually have to be guilty; in fact, what's perhaps the most dangerous aspect is that you don't have to have even been a party to the matter, innocent or not. Someone who just plain doesn't like you can levy an accusation, and even if you've literally never interacted with them in your life, you're guilty. I've seen it happen firsthand.

To quote Cardinal Richelieu, "If you give me six lines written by the hand of the most honest of men, I will find something in them which will hang him."

This behavior really has nothing to do with the nature of the crime at hand; it's been used to discriminate against people by race, by gender, by interest, by religion - by just about anything. Giving human beings the ability to arbitrarily punish other humans, without recourse, is obscenely dangerous.