It is an idea that is worth considering and there are parts of GitHub across infrastructure tooling that are already open source. At
github.com/github you will be able to see all of the open source projects that we have there. Two notable examples are:
The GitHub load balancer which we open sourced back in 2018. It is our scalable load balancer solution for the bare metal data centres and it powers the majority of GitHub's web and git traffic as well as it is fronting some of the principal intel systems.
GitHub Docs which we open sourced in mid October 2020. With this effort, we're able to source new ideas from a broader and diverse set of individuals, especially from those who are experts in the community and GitHub.