The game I've been playing lately is the Oblivion remaster. I know the game is known to have subpar performance, but in Windows with ultra settings and RT set to low I get 130+ FPS outdoors and 180+ indoors, in kubuntu I was getting ~60-80 outdoors and ~100 indoors, CachyOS got me 80 indoors and 50 outdoors with extreme stuttering.
All running on my 3440x1440 144hz monitor.
I just installed Bazzite, we'll see how that plays.
I'm not a lawyer and didn't look anything up beforehand so I could be wrong but I'm pretty sure the only thing that is "protected" legally is the master recording of the song. Which is why things like covers and parodies are legally ok, even though they're more or less direct copies of the song made by a different artist. But if you use the actual recording of a song (even if edited beyond recognition) it needs to be cleared by whoever owns the rights to the song.