The usual answer to something that is both an obvious question and clearly impactful is "yes, extensively". Which is separate from the question of how well the research has been done of course (in either direction).
> I would hazard a guess that this number is an order of magnitude greater than seedy business owners short changing their staff.
What broad data are you basing this on? I suspect this is one of those areas where (nearly) any one persons individual experience is basically useless, because of the inherent lack of breadth. Exceptions made for extremely unusual life/career paths that lead to better sampling by accident.
