Maybe~~ r/iwatchedanoldmovie ~~ Some game specifics sub’s like r/MetalGearSolid, r/MetalSlug and r/HalfLife, r/moddergearsolid is a particularly obscure one.
From my own feed that’s about it, with the exception of some piracy ones like rCemuPiracy r/LinuxCrackSupport and r/SteamDeckPirates, among others. And a couple in particular that push a bit closer to the work unsafe side, so those wouldn’t be here.