Why does Greenland look so big?
On the classic world map, Greenland looks about the same size as Africa. In reality Africa is roughly 14 times larger: about 30.4 million km² against Greenland's 2.2 million km². Greenland isn't big. It's close to the pole, and that is where the Mercator projection stretches the world the most.
How the Mercator projection distorts size
Gerardus Mercator drew his map in 1569 for sailors: any constant compass bearing is a straight line on it. The price is that areas are inflated more and more the further they are from the Equator: about 2.4 times at 50° (London, Vancouver), 4 times at 60° (Oslo, Anchorage) and over 30 times at 80°. At the poles the stretching becomes infinite, which is why Mercator maps cut off the top and bottom.
What happens when you move the North Pole?
Nothing about Earth says the North Pole has to be at the top of the map. Greenlandification rotates the globe so that any point you choose becomes the new pole, then redraws it with exactly the same Mercator maths. Put the pole in India and Asia sprawls across the top of the world. Put it in the middle of Africa and Africa finally looks as enormous as it is, and even bigger.
Every flat map of the world is a choice, and every choice distorts something.