57 times larger in population*
I think you are missing the bigger picture. I think it's safe to say EU has a different play style compared to NA and Denmark doesn't play Denmark players only, where as US basically plays US players. Denmark has all of EU to compete against where these smaller EU countries have higher skill...SK may be an exception.
Well, the US is a productive country and dominates the world market in almost all areas while people in Denmark are no life sad fucks so all of them play games