I would expect open source projects to have a bias toward languages inside the open source ecosystem. Specifically, languages that are open source themselves, o

I would expect open source projects to have a bias toward languages inside the open source ecosystem. Specifically, languages that are open source themselves, or are historically popular within open source operating systems. I would not expect a survey of languages on the proprietary side to match very well. That said, you wrote "a better metric" and I agree.