An anonymous reader quotes a report from Ars Technica: The rumor that Microsoft is building a version of Windows 10 that can only install apps from the Windows Store has drawn criticism before it's even official. Epic Games founder Tim Sweeney took to Twitter to attack the operating system. Although its real name is named Windows 10 Cloud, he's dubbing it "Windows 10 Crush Steam Edition." Sweeney is convinced that Microsoft wants to exercise total control over the Windows platform and destroy Valve's Steam. Last year, Sweeney attacked the Universal Windows Platform API. He claimed (incorrectly) that third-party stores such as Steam would be unable to sell and distribute UWP games, leaving them at a disadvantage relative to Microsoft's own store. He followed this statement with the claim that Microsoft would systematically modify Windows so as to make Steam work worse and worse, such that gamers grow tired of it and switch to the Windows Store. In his tweets, Sweeney recognizes that Microsoft wants to compete with Chrome OS. But he fails to understand what the company must do to actually offer that competition. He wrote that "it's great for Microsoft to compete with ChromeOS, but NOT BY LOCKING OUT COMPETING WINDOWS SOFTWARE STORES." This statement represents a failure to understand that "locking out competing Windows software stores" is, for this market, positively desirable. It's fundamental to preventing the hard-to-support free-for-all that a Windows system would otherwise represent. A later tweet does recognize the value of this lockdown, but Sweeney says that Windows 10's "great admin features to limit user software installs" should be used instead. This again suggests a misunderstanding of the target market: systems will be used with little to no supervision and with little to no administrative oversight. To compete against the Chromebook, Windows 10 Cloud needs to be locked down by default, and it must not offer any ready way to disable that lockdown. In his complaints, Sweeney also fails to consider what happens should the Chromebook threat go unaddressed: Chromebooks running Chrome OS will proliferate. These machines will not support third-party stores, they will not support Steam, and they will not support PC games at all. Sweeney may not want Microsoft to build this world, but even if Microsoft doesn't create it, Google already is doing so.