I don't understand. Are you implying that Greenland can decide to sell itself then?
However, Trump has done everything to turn Greenlanders away, and not done anything to convince them of independence would be good for them, so a vote for independence will likely fail catastrophically right now. Independence is many decades away, as they would really have to build a stronger economy to make it happen, but that is the direction Greenlanders would like to go, at least if you asked them 2 years ago.
It’s like a sleight of hand magic trick pulled on an infant that is then gleeful for the deception.