Why does Steam/Valve care so much about Linux? I know as devs we all would prefer to use Linux/Unix. But developer experience isn’t a good business justification.

It's because Valve's entire business model is currently reliant on Microsoft not being emboldened to try and lock down software downloads to only occur through the Microsoft Store.

15 or so years ago, Microsoft started making moves in that direction and Valve immediately started trying to build and sell Linux based gaming machines in order to try and protect themselves somewhat from Microsoft. Those Linux gaming machines (Steam Machines 1.0) were a massive failure because they were expensive, and had very very limited game support.

Valve then spent around a decade improving Wine, building Proton, and designing the SteamDeck, which was a great success for them and is now making lots of people take Linux seriously for gaming. Now they're moving up the value chain and trying to make Linux the go-to place for PC gaming.

They've still got a big battle ahead of them, but already Linux users are around 4% of active Steam users, and the Linux experience is rapidly improving. Meanwhile, Microsoft seems to be bleeding goodwill, and is actively pissing off a huge amount of their Windows audience while simultaneously giving up on Xbox, so this is really perfect timing for Valve now.

The business justification is called commoditizing your complement. https://gwern.net/complement is a good article about it.

You can basically tailor the OS specifically for the device and remove unneeded bloat. Also the threat of Microsoft and Windows as mentioned by other users. The introduction of the Microsoft Store with Windows 8 basically kicked off this whole move for Valve. While it took over a decade of work, its paying great dividends now.

Probably to keep MS from locking down gaming on Windows and cutting out Valve as distributor.

Add to that, Windows isn't usable on 10ftUI or really anything that is not fully-controlled (think ATMs) or desktop with kb/m.

>I know as devs we all would prefer to use Linux/Unix.

That's not true. In the 2025 SO survey, both Windows is the most used OS for developers, for both professional and for personal use.

https://survey.stackoverflow.co/2024/technology#1-operating-...

Probably because Steam doesn't want to sell an Xbox and Microsoft won't license Windows to be rebranded.

why wouldn't you use linux when you are shipping your own, custom, purpose-built device?

For starters, they can't really customize Windows for the devices they release.

They don't want Microsoft to be able to use its control of the OS to push them out. It's not the Valve needs to control the OS, it's that they don't want a company that views them as a competitor to have said control. Linux ensures that they have protection from that.