Good question! I can’t remember.
I think I read a Microsoft blog or something like a decade ago that said they shifted from a Hyper-V based solution to Linux to improve stability, but honestly it’s been so long I wouldn’t be shocked if I just saw it in a reddit comment on a related article that I didn’t yet have the technical knowhow to fully comprehend and took it as gospel.
I think it’s more trying to win political favor by spending big with the company owned by a member of the incoming presidential administration.
Or it’s just wanting to market their ads on that platform and as you said, not having the balls to stick to their boycott