Flight students are eligible to board the plane, but the company does not arrange boarding, but requires part-time ground crew or crew. Is this legal?

My uncle is a retired pilot, including 30 years as a flight instructor. Are you sure you have finished all the training? Have you been granted the relevant driver's license? If it is true, there is only one possibility: due to the big market situation, the pilots of this company are full, that is to say, there is no vacancy for the time being, and even the pilots who have been trained can be ordered to leave their posts temporarily without pay, or selectively assigned to other non-flight positions of other airlines or companies. This has often happened in the past 30 years, and our instructors are used to it ... your influence is the least ... overnight, it cleared up again: where did you find the pilot? 18 months of training time is not short. Who can accurately predict the market trend?