Game developers have stated that the support requests they get for Linux outweighs the revenue they get from supporting it. There are so many distros with different packages/dependencies, drivers, package managers etc. that it's very time consuming to keep up and not worth it.
I recall seeing similar with major caveats, though. The general "make linux support and they will come" crowd is clearly too big to be meaningful. That said, there was a story of someone that had a bug cut from a linux user that commented how it was one of their best support cases ever. User was engaged and willing/able to work with them in ways that few support cases are.
As such, this is a mixed bag. Actual users that cut support issues from random machines will be worth trying to engage with. General cries that you should support it with no payment in play should likely be ignored, though.
Steam has provided their own container runtime for quite some time, so the packaging and dpendendies are a lot of a problem if you only distribute on steam.
I still prefer they go with the proton approach though.
