Why would they? Is Mono a serious threat? No.

Would it be if it succeeded grabbing market share from Windows? Definitely.

I fail to see your reasoning equaling "something didn't happen" with "something can't ever happen and you are a lunatic for believing it can".

And I know I get downvoted every time I point this out. Reminding people Microsoft never plays nice only makes me unpopular, but it doesn't make me wrong.