I can't think of anything much worse
The small project I work on is a Linux only GPL 2+ one. It's status allows it to have free hosting both there and on Sourceforge. I can foresee real problems if Microsoft muscle in, one of the first being charges brought in. We have no funding at all so in that case (with great regret) we'd have to abandon GitHub and try to find some other second repository. I imagine there are very many projects in a similar position. Knowing their reputation, I guess Microsoft would consider that a good thing - only paying
cust victims remaining.