If Microsoft, come Windows 9 or 10 when it's pure Metro, continue the App Store-only philosophy, where you can only get Metro apps from the App Store, they could tell Valve that they want a x% cut of revenue(MS already does it with Apps on their store) and if Valve says no, then no Steam on Windows. Even if Valve agrees(which would be likely) and there is Steam on Windows, it will produce much less revenue per unit for Valve than the other OS's. So obviously it's in Valve's best interest to get away from Windows.
Also remember that XIV isn't going to be on 360 for a similar reason. MS wanted a cut from the monthly fees. So it isn't past MS to try something like this as well. Especially since the whole merging OS's is mainly a power grab for the money to begin with.





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