They are keeping their wages low by avoiding mandatory pay rises that come with statutory overtime.
So to reiterate: they offer low wages, and their actions are consistent with that objective.
Yet the workers all chose to work there, implying it was better than the next best option available to them. For the employees, they are better off for that employer offering the employment, than not doing so.
So my point stands. You seem to not have even addressed it, and instead made an appeal to emotion by repeatedly referencing the low pay the employer insisted on providing.
>>How about not establishing regular schedules published in a timely manner?
This is the only potentially abusive and fraudulent practice you cited, and I would support class-action litigation to punish employers who engage in it, and publicly funded advocates and watchdogs to assist low-wage workers who find themselves facing these kinds of practices.
The argument that low-pay jobs - that those working them willingly accepted - is by definition exploitation is, OTOH, an economic fallacy that misattributes the cause of low-pay and promotes regulatory restrictions on contract liberty that gravely harm society.