i'm not going to go look for it either.
There is precedence for this. Citizens of Alaska get a dividend on oil royalties every year.
A place like this is going to be dependent on someone no matter what. Greenland cannot exist and defend its territory as an independent nation. So, the question is who. If Greenlanders "want" to be independent and "free", it doesn't matter, because they can't do it.
As always, the question is what is the definition of cruel and unusual.
Putting people who committed crimes to work in order to repay their debts to society has a looooong history. Like thousands of years. I don't think just putting them to work is by itself cruel and unusual. A lot of people including myself, think it is better if they work and contribute something to society than just sit around in a cell.