How such schemes can even be accepted as a cadet scheme beats me, because they're not.
These 'cadetships' are kind of like what the law firm in the below article tried to get away with. Charging graduates $20K for a foot in the door to become a registered lawyer.
It was promptly stamped out by the law society of SA a few months later. How airlines get away with it and charge $150K is beyond me...
Law firm Adlawgroup asking junior lawyers to pay $22,000 for job; Fair Work Ombudsman investigating - ABC News (Australian Broadcasting Corporation)