PAYDAY 2 came to Linux officially back in 2016 but as of today they've removed support for it, so it will no longer see updates on the Native Linux version.
It does, however, still work quite well with the Windows version via Steam Play Proton on desktop Linux and is Steam Deck Verified against the Windows version in Proton. So while it's a loss of support for their Native build, it's still fully playable on Linux.
Same, as long as they continue to test and verify the game works on Proton and provide support for Linux users using it, the game still works on Linux. Wine/Proton and DXVK/d3d12 have gotten really damn good these days, and I don't mind that games are relying on them to work well on Linux if they actually hold true to officially supporting Proton as a platform.
Yeah, I prefer native if possible, but I understand that it's not likely to gain much ground outside of the indie/FOSS community. Proton is a lifesaver, made switching over to Linux fully orders of magnitude less painful.
Opposed to most other people here I would like to say that making your game support dependent from a software that 95% won't be able to install or use without getting a partly closed source DRM "app-store" software is - in my book - a bad idea.
I'm afraid that in the near future most developers are going to completely abandon the idea of maintaining and creating ports for linux and instead make sure that the game works well enough on proton. I'm not sure how to feel about that though.
Honestly I think it's a good thing. With wine we're reimplementing the win32 api, which means that we make things more portable. This brings games to more devices with less hassle, and I'm all for that.
I'm okay with that, I used to be against, but I've come to realize that the only way to break the chicken and egg problem is to bring people over to Linux. Once the market share is large enough native versions will be appealing, and we can (and should) start to be stricter about non-native versions, but at less than 2% of Steam we're too small of a market share to be making demands, even if that means millions of users.
As long as proton has good and proper support. Like not pushing an update for the game if it breaks proton for example. You know, actually test things and don't make us feel like an after thought.
At the end of day, games are just proprietary binary blobs so them being native or not doesn't make a huge difference.
Lets be honest, native Linux game used to be second class citizen anyway even when officially supported, at least Proton does a really good job running those Windows games.