Comment by xzjis

In reality, Valve is doing all this work on GNU+Linux because they've been afraid of Microsoft ever since Windows 8 and the introduction of the Windows Store. For now, Microsoft is remaining open and isn't restricting installations to its own store; we even see that with the full-screen gaming version of Windows for handhelds, they display games from other stores, including Steam. But Microsoft also has a history of abusing its dominant position and monopoly to push its own products (Internet Explorer, Edge, OneDrive, etc.). Gaben made the only possible decision to protect Valve from that: having their own OS.