Finally wrote a post that's been stewing for a while: What You Miss By Only Checking GitHub
Many researchers, entrepreneurs, open source sustainability commentators, et al. assume that GitHub activity is a reasonable proxy for FLOSS as a whole. It's not.
Goes over some examples, a marketing graphic that made my eyebrows go up, research about how unrepresentative GitHub can be, and some tools to try.
When you come across some new headline or initiative or statistic about open source, it's worth checking: do they only mean "on GitHub"? Kind of like when I see a headline about "everybody" and they mean "in the US".
A Fediverse instance for people interested in cooperative and collective projects.