"you are using MS code already."
Perhaps. Perhaps not. Have you read the modified Slackware-based source that I use to compile my system? If not, how can you make that statement?
However, just to play Devil's Advocate, let's say I am.
At least it has been thoroughly vetted by Linus & the rest of the Kernel dev folks ... and by a bunch of fanboi hangers-on, each eager to make a name for themselves finding bugs/holes/backdoors in MS submitted code. Can't say the same of anything else that Microsoft inflicts on the world.