'Stabbing in the back' generally implies betraying someone who trusted you. I don't think that's really applicable here: Canonical are directly competing with M

'Stabbing in the back' generally implies betraying someone who trusted you. I don't think that's really applicable here: Canonical are directly competing with Microsoft. For what it's worth, that slogan seems to have been changed now: the home page now just says "Your wish is our command." Though I'm sure critics will still see plenty of irony there.