Griffais says the company is also directly paying more than 100 open-source developers to work on the Proton compatibility layer, the Mesa graphics driver, and Vulkan, among other tasks like Steam for Linux and Chromebooks.
I would imagine they still pay outside, open source devs to work on those initiatives, though maybe not as many since they’ve gotten past the initial push.
AFAIK no, and we probably never will. But we do have glimpses into it, such as this article saying Valve directly paid >100 devs to work on Linux compat:
I would imagine they still pay outside, open source devs to work on those initiatives, though maybe not as many since they’ve gotten past the initial push.