Why don't you back up your statement with data? Your argument (that most developers live in the USA) is the one that requires convincing. Maybe you slept through your social studies class but USA is just one part of the world and there are many other countries. And they all use computers and smartphones. And it's obvious American developers are not the ones who coded apps that run on them.

I do not have any real data to back up that statement. But I'm pretty sure about it.

edit: To explain a bit, just take web developers. No one would outsource creating a web page to US (or wherever it would cost 10 times the money). Various Information Systems as well. Even bigger US companies have usually development centers in some "poorer" countries.

Take the USD appreciation in front of most currencies and you'll have a made up yet pretty reasonable estimation.

70 sounds fine but what about 210 for a text editor? That's how it feels in Brazil for example.

Europe west/north of Germany is very rich compared to newer EU states and eastern Europe in general.

That sounds a lot like priming. https://explorable.com/priming