Tim Sweeney, co-founder Epic Games and architect of the Unreal engine, isn't happy with Microsoft's new Universal Windows Platform:
With its new Universal Windows Platform (UWP) initiative, Microsoft has built a closed platform-within-a-platform into Windows 10, as the first apparent step towards locking down the consumer PC ecosystem and monopolising app distribution and commerce.
This isn't like that. Here, Microsoft is moving against the entire PC industry - including consumers (and gamers in particular), software developers such as Epic Games, publishers like EA and Activision, and distributors like Valve and Good Old Games.
Microsoft has launched new PC Windows features exclusively in UWP, and is effectively telling developers you can use these Windows features only if you submit to the control of our locked-down UWP ecosystem. They're curtailing users' freedom to install full-featured PC software, and subverting the rights of developers and publishers to maintain a direct relationship with their customers.
Microsoft was given the opportunity to respond in another The Guardian article, stating:
In response to Sweeney's allegations, Kevin Gallo, corporate vice president of Windows at Microsoft, told the Guardian: "The Universal Windows Platform is a fully open ecosystem, available to every developer, that can be supported by any store. We continue to make improvements for developers; for example, in the Windows 10 November Update, we enabled people to easily side-load apps by default, with no UX required."
We'll see how this plays out, but Microsoft has a horrible history when it comes to these things.