I hope time will prove me wrong, but this acquisition is literally the 'embrace' phase of E3. Next comes the 'extend'.
It doesn't need malice but Microsoft have a talent for this kind of thing
It took 18 months and nearly $1B to rewrite only to find the market had moved on. Canned and written off
I can imagine a situation where Microsoft thinks that GitHub would benefit from being re-implemented using Microsoft tech. Rewriting in APS.net, using Microsoft Login, integration with Office 365. The whole enchilada :)
It would take years, cost billions and, at best, deliver exactly the same experience as GitHub today
Worse case would be that GitHub stagnates during the rewrite as the alternatives spend their time and money developing new features
I was contacted by a recruiting firm for an interview in Microsoft, probably in the 90s or maybe in the early 2000s. I answered no thanks.