You can be happy working at a lower salary, doesn't mean that its not exploitative or that it distorts the labor market. Especially with the knowledge that the company holds your residency in their hand.

What does WITCH stand for here? Haven't seen that acronym before

I bet they’d be even happier if they were paid the same as American workers, seeing as they’re doing the same job.

If a minimum wage worker happens to enjoy what they do, that doesn’t mean that we should all settle for minimum wage. Your argument is toothless and blatantly anti-worker.