ex: D3 was/is really mike bostock. the exception there has been, afaict, the GIS packages and maybe changed over last 1-2 years
ex: we use 'got' for JS HTTP, and most dev is 1-2 devs moving quickly, and community for QA
ex: caddy felt the same, but that may have also changed post acquisition
interestingly, all 3 support plugins/galleries for occasional non core contribs
the article was clever to observe that most commercial sw does bump up bus factor in a funny way: sustainable bump.. but typically goes up by only a little!