A quote from @github's blog post about being acquired by @Microsoft, 'Open source and business, people said at the time, mixed as well as oil and water.' I am pretty sure people still say that quite a bit.
Also, championing one open source project by Microsoft does not mean they have embraced open source in general. They also bought their way onto the Linux Foundation but that does not mean they are fans of Linux no matter how many pictures they make of them hearting Linux.