Even if all of what you wrote is true, in the Listener Notes statistics the US still makes up 10X as many as the next largest country (~800,000 vs 80,000), and would be the highest per capita by a significant margin of any large country. Assuming it's not a data problem (which I think is actually likely due to hosting), let me offer an unpopular possibility—Americans are just the most productive creatives on Earth. A culture full of side hustle.