In fairness, many of these are open source and at least in the case of pip, for many years there was literally only two maintainers although now there a couple more. This is what I learned at one of the python conferences.

It’s odd how open source packages that big companies use can be reliant on so few people.

Edit: although checking the pip github, there more people committing so maybe I got something wrong, but there is far more activity starting around 2019.