Re: How about
One has even modded the copyright notice on his code to add 'Not to be used on any Operating System owned or controlled by Microsoft Corp or any of its subsidiaries'.
I see that as a joke, but that's not really enforceable, because we and our GitHub code are property of M$ now!
(No ... just kidding: If the code was under GPL, then there's a clause that prevents the author from controlling the manner in which the code is used)
I won't go that far but there is a real feeling of hurt that GitHub has betrayed FOSS people big time
$$$$ talks, abstract ideas and perfect notions walk.