“All of this work is broadly applicable to the PC platform, and it’s going to continue to expand over time. Supporting multiple platforms, multiple chipsets, controllers for different machines that are out there and even ones that aren’t out yet.”
[…] Valve’s goal with the OS is to have it compatible with traditional PCs, laptops, portable consoles and any other formats.
Yeah, you’re right, MS hasn’t challenged wine in court and I was thinking of that lawsuit.
Apparently it was since decided in appeals that not all API implementations are covered by fair use.