I think this is not the best representation. Although I appreciate the commentary of the blog. Is github a valid platform for this kind of sampling? I dont know I have hundreds of java repos elsewhere and would never host my code on a Microsoft platform. But somehow Kotlin is not represented when it's the default language for android....because mobile projects don't host on github publicly. And what about PRs makes them special anyway? As one commenter mentioned this could be more about volatility/stability.

As a side note, I'm pretty shocked that the OSS community is "just fine" with leaving their projects on github after MS took over and scanned all their code for machine learning.