The better value proposition lift from giving folks and teams more free private repos was huge, and the increasingly-prominent integration of Github into enterprise tools is facilitating (if not helping to force) the modernization of enterprise dev outside the software industry.
I've never been a bigger fan of Github, personally. Microsoft seems to be doing the same with Github that it did with Minecraft: amplifying what it does well, fixing what it didn't, and making it more accessible to more folks the way they want to consume it — all while not compromising what made it great to begin with.