I felt enormous sympathy for my coworkers here with that visa. Their lives sucked because there was little downside for sociopathic managers to make them suck.
Most frustrating was when they were doing the same kind of work I was doing, like writing Python web services and whatnot. We absolutely could hire local employees to do those things. They weren't building quantum computers or something. Crappy employers gamed the system to get below-market-rate-salary employees and work them like rented mules. It was infuriating.