It depends on how you acquired it. Nobody can take the license for your pirated, modded fallout. Literally buy it anywhere but itch.io? You probably don't.
It's quite alright, but the platform hasn't really grown in a while outside of its available catalogue. Gog galaxy is still in beta I think and it also still has no Linux launcher yet. Still good for the no DRM part tho
Between Lutris and Heroic Launcher I have been able to get every game I play running. Some took some tweaking (Fall Guys and Rocket League the most), but they all run and work with online play now.
Thank you, and since I'm not replying to everyone thank you all. I'll give that a good look when I begin my linux gaming journey this winter break. Luckily my week knows we're children and we get this off.
Protondb has a lot of comments on each game as to how to get it running. That's always my first stop if something doesn't run immediately in a launcher.
You can download offline installers that don't require an internet or licence key to install, so if you back them up I'd say you own them to the same degree you'd own a game on optical media