Well that's part of the issue with for profit education, if the student pays significant money for tuition, is he a customer or a student?

"The student is the customer" is a stupid metaphor that only caught on because a lot of people would rather just bring in dollars than worry about "are we actually teaching anything?"

It's not a metaphor. They are literally the customer.

They're a customer in the same way that a martial arts student is a customer: getting your butt kicked is literally what you're paying for.

Sure. And just like with a martial arts student, if you kick their butt too hard, you will lose the customer and might get sued.

Sued for giving out hard work assignments? That doesn't sound plausible. Under what theory would a student have a case?