That, if true (since you didn't link any sources), sounds at worst like the kind of exploitation that Westerners like you and me rely on (from "undocumented" or even documented immigrants in your own country, resource extraction sectors in developing countries, cheap overseas manufacturing, etc) that allows us to make the illusion of a living wage from what little work we do in comparison. In reality Cuba would actually be far less exploitative than us because we do all of what you described and much, much worst to people you never see or think about. Where did that cobalt in your phone come from? What about your chocolate? Where does your e-waste go after you drop it off at a big box store before buying the newest thing? Cuba at least doesn't prop up their own citizens at the great expense of people they deem less important.