So as we know Windows Platform Apps and WinUI3 apps do not work on Linux, I keep wondering if Microsoft were to launch a new API let’s say direct X 15 but limit it to Windows Store Apps, and provided a way for the apps to be installed from other stores like steam could they in time kill modern Linux gaming.
even then Microsoft would not survive the EU as these changes you mention are solely to gatekeep gaming to their platform.
Also given Vulkan being pretty on top of things, HDR FSR/DLSS, Raytracing; Devs could simply opt to use the non-propritary interface.
Also, besides the EU, Microsoft would get A LOT of flak from digital Store Front Vendors like Steam, Epic, Blizzard Activision, EA…