If they are using the program as intended they would. They are supposed to be looking for skills that are impossible to find in the US. If they are offering a good deal to the employee then the employee should stay, just like someone with full work authorization would.

If they are just using the program to pay less than they otherwise would for labor that does exist in the us, well, then we have another issue.

I would modify the proposal to include a larger annual fee rather than an application fee, so that the initially sponsoring company isn’t solely bearing the cost. There should also be a floor pay rate for the visa holder, something the 75th or 80th percentile of both the company and of income in the MSA the visa holder is located in.