So if you want a machine that can play games and run a Linux dev toolchain, that would require a Windows install. If you can incentivize folks who may never have installed Windows to do so, and keep them there as the only place they can both play games and use their preferred dev environment, then you've extinguished that portion of the desktop linux install base.
EDIT: Also I absolutely love the "I don't think Microsoft thinks so either." Microsoft is a for-profit corporation who's eyeing a way to get users who traditionally avoid them to come to their platform and stay there. They aren't some benevolent font of cool tech, they're trying to sell you products.