Re: "Windows as a Service"
My read on the overall strategy is to try to out-Google Google which explains the abomination of Windows 10 to anyone that's even a mild privacy advocate. That would justify 'giving away' the OS. That they are extending their cloud products over to iOS and Android plainly makes it clear that they want a slice of every platform's revenue production in their pockets in a stream of revenues. They don't have to charge the users directly to pull this off, simply monetize the users to support further development and, of courses, patches from the Windows 10 team.
There are other advantages to their current strategy, but that's what's on point here.