Despite Luna originally using Windows for Amazon's game streaming service, it appears they may be moving over to Linux and they're looking to hire people to work on Proton / Wine and give back to open source.
Hold up. Don't know what Proton is? It's part of Valve's Steam Play, be sure to check out our full guide.
Across a few job adverts (#1, #2, #3), they mention how the roles involve "working with Proton - a compatibility layer to run Windows games on Linux using Wine" and that they are "committed to working with the open source community around Proton. This role will commit code to open source projects such as Proton and Wine in pursuit of running games in a stable and performant manner".
Regardless of your thoughts on cloud gaming, this is still pretty great news for Proton and Wine that might see more people work on it and improve it further to get Windows games running even better on Linux!
Amazon give a little more detail on the roles that you can expect to "solve hard technical problems in Linux graphics stack, starting from Linux Kernel to graphics libraries" and work with "DirectX, Vulkan, DXVK, and OpenGL" and of course "dive deep into graphics performance issues and provide solutions that enable Windows games run on Linux, and make contributions to open source Wine/Proton".
Perhaps with Amazon working directly with Linux and Wine / Proton, they might even officially support playing Luna on Linux, whereas last we saw it threw up a box to say it's not supported. Would be thoroughly odd to go through all this, and still not even support playing it on Linux since it just uses a browser.
Luna is what a lot of what people hoped / thought Stadia would be initially, with subscription based to access a growing library of games, rather than Stadia being a store with an optional subscription part. It will be interesting to see how Luna progresses once it's out of Early Access and expands from being only for the US right now.