It doesn't really happen to big companies because they have the power to sue.

Every individual I know who's run google ads has been banned right before a payout at some point. They generally all in the range of $3000-6000. It's an amount that's a decent sum, but only to people who don't have deep enough pockets to afford a lawyer to go against a megacorp.

I'm not convinced it's not intentional. The banned people probably aren't generating that much in profit for google, and seizing a few thousand dollars from a customer who's likely to just cancel services at some point probably has a better payoff after a certain threshold. No google employee will ever explain how it works and there's zero support, so I doubt my mind will ever be changed on this subject. One thing I do know is Google isn't a stupid company--just evil. The problem has been too consistently occurring and too consistently ignored that it can't just be incompetence. Say it's spam and show a couple suspicious figures if anyone really tries to investigate and you get off clean.

Knowing Google they probably are using ML to maximize revenue, and the black box is causing the system to fuck little customers over. Oh well, it isn't fraud, they're just doing what the algorithm tells them to.