They are “migrant workers and students from rural areas”. They are willing to live in such abysmal conditions for a few years because it holds the promise of a strong quality of life improvement after that.
They are fucked, as they will graduate to the world of "996" and still live a dismal life. Such are the ways in cultures with a steep "power gradient." If all persons are not created equal, then someone deserves steak eggs while another deserves beans and shit. All one have left is connections, and no measure of hard work will make the graduate from a farm family the peer of the graduate from a family of Party princelings.