Former H1B here. The abuse is real, but what many people assume incorrectly is that it's perpetrated by FAANG companies. Those are actually pretty good places for an H1B to be, generally speaking (subject to the usual caveats wrt hostile management etc) - they pay the same they do to citizens, and it's very rare to see revocation of status used as a threat.

But if you look at the overall visa numbers from a few years ago, they are dominated not by FAANG, but by "consulting" companies like Infosys. Those are straight up sweatshops who squeeze everything they can out of their H1Bs while underpaying them (and thus also undermining the local market).