It's a real shame. I use GitHub every single day as part of my main job and I use it for my own business too. I am really quite afraid of what Microsoft is going to do with it, GitHub has been losing money for quite some time and I am sure Microsoft will attempt to monetise it further than GitHub already has.
I fear it will become like SourceForge. Good news is we still have GitLab and BitBucket. Both of which are growing in momentum even before this news.