Of course, there are plenty. But repaying training fees aren't one of them unless they don't make sense. If you're a cashier and after 2 hours know how to do

Of course, there are plenty. But repaying training fees aren't one of them unless they don't make sense. If you're a cashier and after 2 hours know how to do your job, your employer can't write a contract that says "Training costs $500,000 and you must repay if you quit before 5 years". Contracts law is well developed and you can't sign a contract where you don't receive consideration. And I assume if such consideration is small, but the obligation is huge, the courts won't enforce it.