Supporting someone being able to do that legally is one of the tough things that comes with being a Libertarian.
Tough to separate ethics from law, and I have a tendency to additionally think that whoever was getting into that practice to take that position would be new to the field and not really understand what they were getting into.
Nothing says "time to swim" like tossing someone into the ocean and taking your boat back to shore to enjoy the beach.
This is one of those places where perhaps it would be the duty, not of the government, but of the APMA to step in and disallow practices like that for the sake of the profession.
Like I said before, I'm all for someone creating wealth by hiring new hands to do work and reaping some of the benefits, but the specific example you discuss seems to be detrimental to the DPM degree, and would probably wind up hurting the newest practicing pods far more than someone who's been around for a while and can read between the contract lines and see the bum rap they're getting.
I think there are a lot of people looking for jobs that first year out of residency that would have a hard time saying no to a lot of positions they should probably walk away from, and from contracts that screw them without them even knowing it.