Google's Stadia specs said that Windows, OS X, Android, and iOS would be supported--nothing about a Linux Stadia release for a specific distro.
They are talking about their Stadia client. I'm talking about actual games developed for Stadia, which uses Debian Linux to run them. I.e. Stadia games are all Linux games, but they run on the server. Once developer makes a game for Stadia, it basically just needs some trivial modifications to make a normal Linux version. So when they don't plan to do it (while in case of Larian they are in general positive about Linux releases), it does look like some exclusivity ban. I surely hope it's not though.
Link for "all Stadia games will be natively written for Debian"?--I mean, hundreds of popular games have no Linux version available at all, so Stadia will of course be running Windows on their servers as well as whatever other OSes they may run. Stadia will also be selling games *at retail prices* as well as Streaming them--and of course Windows games will be sold through Stadia--just like any current distribution service. Here's the thing I can't understand at all: running a Linux distro native game (not emulation because I can''t recommend that at all...;)) doesn't mean the game is going to look/run a bit better than it does on Win10--indeed, because of a number of factors it could very well run and look worse than the Win10x64 native version of the game.
So what's the attraction to computer gaming on a Linux distribution? Basically, emulated Windows games on Linux make up a big share of the total number of Linux games, and compared to native Windows game development, native Linux game development is a very tiny percentage, indeed.
I'm not making any sort of judgment here--just stating the objective facts as I've seen them develop over the years. What I have noticed is that people who insist on gaming on a Linux distro (Ubuntu on Steam--which you apparently don't use--since you don't use Steam for Linux gaming, you say) are not "hobbyists" or "enthusiast" computer game players--they are much more what I might call "casual" gamers who can generally take gaming or leave it as gaming just isn't a large priority for them. Conversely, the people who are very involved with computer gaming are almost always Windows users--for many of the reasons I've alluded to and several other reasons I haven't mentioned like backwards compatibility stretching back at least three decades supporting early Windows versions and even MS-DOS, and commercial device-driver development for GPUs and all other devices--the importance of which cannot be overestimated, imo. (I mean, Open Source driver development generally does not compare, imo.)
Summing up, I've run as many as three simultaneous OSes before for multiple machines for extended periods (Amiga OS--Workbench up to 3.1, OS/2--several versions, Windows several versions--and DOS, of course) and I can testify that it's much nicer/simpler/easier to choose a single OS and stick with that...;) So if your choice is a Linux distro and nothing else I can't argue with that...;) But the fact still remains that for people for whom gaming is much more than a take-it-or-leave-it proposition--and Linux distro rather than Win10 (this latest build, v1903, build 18362.1000 is probably the very best Windows OS I've ever used--better backwards compatibility than Windows 7, for instance--if not the best OS I've ever used, period. The hardware support and software compatibility of Win10x64/32 is simply the very best available at any price of any OS I can think of atm. Linux distro can be great for certain tasks--no question about that! But for gaming?--nothing beats Win10 atm, imo.