What would be even more cool is if GitHub had a residency program for top OSS contributors / maintainers where they could work - with benefits pay etc - on their projects under GitHubs employ. Kind of like how some Journalist outfits (e.g. Mother Jones) have their fellowship programs.
Big tech companies do have the resources to do this, and its not like there isn't precedent for it in the industry. This would just take it to a whole new level.
I also imagine the marketing positivity would be pretty strong for them.