GitHub raised $250 million last year and, as you mentioned, there's nothing externally visible to show for it (as consumers of their public platform). (random guess: the $250 million could have been $150-$200 million in cashing out stock to individuals (like crooked groupon shenanigans) then maybe $50 million for operations? How many billions of dollars does it take to write an issue tracker with more features than redmine from ten years ago?)
Same comments were making the rounds months ago too: https://news.ycombinator.com/item?id=10165681#up_10166913
All this gets back to a bigger trend we see these days: closed platforms are like governments (google, apple, github, twitter). We don't allow (sane, first-world) governments to exist without citizen representation. We must demand user-level representation in corporations running global scale closed platforms everybody relies on. Community powered social platforms don't exist without the community, and private corporations exercising extended "we don't give a crap about the users even though we have millions (or hundreds of millions) of them" patterns must be... corrected.
No Computation Without Representation.