I had a friend roped into this at a rentsl car agency and all it meant was more work and his pay got docked when anyone damaged a car. it supposedly came back if the company could recoup their losses but lol they'd never inform him that they'd done so.
its also for union busting, have family that would constantly be offered manager positions to entice them out of the union. usually they were key members of a union like stewards
generally if someone did take the manager slot, they would be fired shortly after because they no longer have union protection
This is how it was at my last job except we managed to strong arm them into giving us overtime anyways because we were so chronically understaffed that they'd have full shifts go unfilled otherwise