Other than what I would consider perfectly rational dislike of Microsoft (they have a long history of making the world a worse place), some people are old enoug

Other than what I would consider perfectly rational dislike of Microsoft (they have a long history of making the world a worse place), some people are old enough to remember what has happened to some of Microsoft's other acquisitions†, like Skype (which went from a promising p2p client to a funnel for the NSA which still doesn't work well or reliably). And consider what they've done with Windows 10: ads in the 'free' solitaire game (unless you pay a monthly fee), ads in the start menu, &c. &c. Anyway, I think for lots of people it's just an impetus to move, a final push: Github is closed source, and there are competitors which are open source or at least 'open core'. † Linkedin admittedly still seems pretty much the same, but even Microsoft would presumably have a hard time making Linkedin worse.