GNU/Linux gamers are always decrying GOG, saying they won't buy stuff from them because Galaxy doesn't run on GNU/Linux, now we're getting people saying GOG porting Galaxy to GNU/Linux is bad!? By Taranis, GOG just can't get a break, can they?
The vast majority of Linux users are very happy to get an official GOG Galaxy for Linux. I hope they will plug into Proton and collaborate with Valve, but we really need official tools and brands on Linux for common users to feel comfortable enough to come over.
Here's Linux built on GitHub Actions, with Grub[1], and you can't do anything with it. I include a reference init that does nothing, per kernel.org. 17.8 MB image.
GNU is by every practical measure, everything else. People memed on Stallman for the whole GNU/Linux naming, but he's basically right. There's also Android/Linux, that another user mentioned, and some distributions which don't use a GNU userland at all.
But the wide majority of people are using GNU/Linux, or some ecosystem derivative of it, like people using GNOME, which was formerly a part of the GNU project.
The latter had been designed to be a full OS but didn't have a functional kernel when Linux was released, and Torvalds adopted the GNU userland for his project.