They overhire so they have plenty of bodies waiting for work. You are not paid if you don't have work. You are available 24/7 because you need to make your minimum count. If you have benefits they can take those away if you do not meet minimums because of no work. There is an overabundance of qualified, ethical MTs. I think the ditzy ones have long ago left. It makes perfect sense. Remotely moral? No.