Per Greenlandic laws, they own the mineral rights. They can license rights to others, and Denmark will also receive a portion of the profits.
Unfortunately, this is the model that American conservatives and billionaires hate. The idea that a country is entitled to their own resources is repulsive to them. This is also one of the things fundamental things where American vs Nordic mindsets are worlds apart.
It is arguably also the real reason why US attacked Venezuela.
Yes, those crazy Americans who are so loyal to America and not any other country at all, really hate it when other people have things that God promised to them instead.