Sort of an extension of this: does Google Stadia availability imply an official build for linux? Are they under some kind of exclusivity agreement with regards to a linux version?

Not necessarily; technically there is a Linux build being developed, but it being used on Stadia doesn't necessarily mean it will be released to others.

Just Dance 2020/2021 is a good example of this: the PC version was discontinued in 2017, but 2020 and 2021 were also released on Stadia -- without an accompanying PC build.

I think it's mostly that CDProjekt and GOG got called out by the Linux community for pulling support of the Witcher 3, and some other things. The CEO had a bit of a tantrum about it and now won't support Linux.

Witcher 2 for Linux was pretty crappy though.

It is about the only linux release I've never managed tu run.

I mean CDPR staff did get death threats, let's not forget that in this story.

While there's no reason to send death threats because a game company pulled support for $OS, there's no reason to pull support for $OS because of death threats either.

There's always someone really, incredibly angry on the Internet.

I agree but painting the CDPR tream as "having a tantrum" without context is disingenuous.

The difference with an official linux build vs Stadia using linux is the fact that they (currently) have only one hardware configuration to worry about.

If they are using a traditional driver setup wouldn't the software be the problem rather than the hardware i.e. Vulkan is Vulkan, Ubuntu is not Arch?

Cyberpunk is a DX12-only title, isn't DX12 under Proton still relatively immature?

Death Stranding was another recent DX12 release and it looks like Proton struggles with it