That isn't Mercator, then the longitude lines would be parallel and not converge at the pole like that. Greenland really is massive, even without the Mercator distortion.
A lot of people still go by the NATO vs Warsaw Pact division that we grew up with. I still have to envision Czechia as the western part of Czechoslovakia.
The difference (claimed by the comment above) is in the words
So you can convert back and forth without the photo copy of a photo copy problem.
And you don't have to store the second copy of the file except for caching of frequently fetched files which I'm sure will just be an nginx rule.