Outsourcing the uncritical would-be employees makes that kind of differentiated treatment even easier to pull off for our monkey brain without losing any sleep over moral qualms at night.

But that's probably a good thing: at least the outsourced eg cleaners have a better chance of being the profit centres of the cleaning company than they ever would at eg a bank or Google.

Ultimately, if anyone has a moral burden to help lower income people, it's society as a whole (and that means mostly its richest members who bear the brunt of taxation) instead of just eg Walmart (and Walmart's mostly poor customers): we can't afford to penalize companies whose business model hinges on employing low-skilled people. Otherwise we'll get even less opportunities for people low on opportunities already.