I think you're being a bit unrealistic about how people behave. The H1B does give a lot of extra market power to employers because it means the employee has a l

I think you're being a bit unrealistic about how people behave. The H1B does give a lot of extra market power to employers because it means the employee has a lot to lose if things go wrong. The threat of being fired carries with it a much greater weight than for regular citizens. Sure, the employee can interview for another job and applying for a transfer is not a difficult process. But, even with another job, the threat of being fired is still a huge pressure. Plus, there's still a risk that the employer will find out they are looking for another job before they find one. Also, employees are unlikely to complain or make requests, since rocking the boat could get them fired and sent home. Most people are not risk takers and are not confident at being able to hide things.