I would like to think that these efforts eventually catch up with the perpetrators in life.
I suspect these catch up to the perpetrators in the college years. I can see such cheating working in large undergraduate classes, but have a hard time seeing it working later on once they get to upper division courses. By then, class sizes are smaller, teachers get to know their graduating class members and have the same students in several classes across multiple semesters. Unless there is some complacency going on such as the school wanting the football player to pass and putting pressure on the teachers, I have a hard time seeing it being a reliable method for getting a degree.