Per capita they are also the largest arms dealers in the world. Per capita doesn't say much about a country overall.
The US and UK (and less so Germany, France, Israel and Japan) produce a sizable majority of software products, especially at an enterprise level. At a per capita level, that gap is even larger with China; and countries like Sweden and Norway become top players.
Or you accept that a comparison simply can't be made and don't make the argument in the first place.
China’s per capita software production is dragged down by its massive rural population, many of whom have never even owned a computer other than a smartphone. If you don’t account for that, then obviously wealthier/more urbanized countries will have higher per capita production.
However 1 in 5 are 'migrant workers' with no fixed address. I'd guess they are the least educated demographic.