If they value more the money than the work itself (i.e. the experience they're going to gain from doing the internship), then they won't choose to do the intern

If they value more the money than the work itself (i.e. the experience they're going to gain from doing the internship), then they won't choose to do the internship. There is a choice, it's just that nobody controls internship wages, and you can't do anything about it, even less by regulating it..