We are talking about the scene in the early '80s.
Products were sold in shops and via mail and were advertised on magazines. Remote networking was on Bulletin Board Systems - and with limited diffusion. The hacker coding his¹ product probably did not easily have those things around.
¹(A 'his' that calls for a pluralized 'her', out of respect to a group that created a closed-doors women-only community in Ireland and produced "women-only" themed adventure games: they were in a way similar to a sect but sold their own software as part of the funding - I cannot remember names right now. I believe there exists a photo of a group of coders with two ladies dressed in Victorian costumes (which apparently were the uniform in said community), after a social gathering. This gives an idea of what could contribute to the scene.)
I don't think that's the case, I think it's that the achievements form the English and the Dutch are shared on the English speaking internet so it's more easily to run into them VS for example, the German speaking hackers who, at least in the past, only shared their work on the German speaking internet instead, so their achievements are less likely to get international visibility.
It's the same with other cultures that have a huge population/market share. If you'd venture on the Russian speaking part of the internet, you'll find a gold mine of hacks, cracks, reverse engineering, and crazy software that flies under the radar.