> Mr Newell, who worked for Microsoft for 13 years on Windows, said his company had embraced the open-source software Linux as a "hedging strategy" designed to offset some of the damage Windows 8 was likely to do.
> "There's a strong temptation to close the platform," he said, "because they look at what they can accomplish when they limit the competitors' access to the platform, and they say, 'That's really exciting.'"
> This is seen by commentators, external to be a reference to the inclusion of a Windows Store in the Microsoft operating system.
Having an open platform is good for consumers, but Valve is primarily looking out for themselves here. Gabe realized that windows could take Apple's IOS route (i.e. https://blog.codinghorror.com/serving-at-the-pleasure-of-the...) and lock down their OS, and everything he's done since has been an effort to protect his company against that existential threat.
GabeN was the lead developer on Windows 1, Windows 2, and Windows 3. When Windows 95 launched, he was a bit upset that no one was making games for Windows. He did a rough port of Doom to prove the viability. Around the same time Alex St. John, Craig Eisler, and Eric Engstrom were building DirectX, GabeN saw the potential, left to create Valve, and proceeded to try and making Windows gaming a great thing.
I can only imagine that he was heartbroken to see Windows go the way it did with Windows 8, 8.1, 10, and now 11.