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.
In my view, this is the most aggressive move Microsoft has ever made. While the company has been convicted of violating antitrust law in the past, its wrongful actions were limited to fights with specific competitors and contracts with certain PC manufacturers.