Alternatively, every business (or rather, the people who operate and control that business) have a moral obligation not to unreasonably exploit their employees.

I would expect that to be a fairly common sentiment/belief (though I might be wrong).

It comes down to the particular definition of 'unreasonably' that is being used, which different groups can and do disagree about.

That's fair. For instance, company stores in mining towns were clearly designed to trap employees into a lifetime of debt with almost no personal choice in the matter.

It's the choice aspect I focus on. No one is forcing them, and it's borderline elitist of someone with a nice job to say "that's gross work and I think it should go away so things are less gross", along the lines of thinking families straddling the poverty line should simply "eat more quality food"