I'm guess it's the external community culture they want to keep. GitHub has been looking for a new CEO since last August, and one of their other guys had actually taken over many of the duties in the interim.. They have had some high profile scandal/dramas(with one coinciding fairly closely with last August CEO search...). I'm guessing any internal culture related to that stuff as well as not making money is probably on the block.

GitHub was not profitable, obviously you change the CEO.

GitHub CEO stepped down in August 2017. They haven't had anyone in the role since then.

I was not aware of all the CEO troubles, makes sense then, on that front.