It's surprising how Wild West it gets out there. In the EU that would strictly fall into unlawful working conditions; I kid you not, in Spain the law doesn't allow to work overtime for more than 80 total hours per year.
I just didn't want to get into that angle in my comment. Of course there is widespread abuse. But precisely, having this practice explicitly ruled out makes a huge difference and allows calling it "abuse" instead of "just another Tuesday", which is the stepping stone on being able to defend against it.