> labor/resource-intensive, expensive, and hazardous to ecology and to humans

This is exactly why Greenland could be needed to compete with Chinese production. With Greenland an offshore legal gray area like Guantanamo, you just need to add work camps stuffed with "Illegal Immigrants" and other Enemies of the State. In fact, why have prisoners on shore at all when it is more profitable to have them work offshore? With foreign news sources banned because of False News, the huddled masses will be educated that this is a good thing.