Is emulation illegal to you? ——— Nope. Emulation is 100% legal. Piracy is not. That's from a legal perspective though. Morally speaking It's a bit more complicated I'd say. I wouldn't have any issues with someone downloading a ROM file of Balloon Fight for the NES, but if you're the type of person to download Switch ROMs of recent indie games to play them on emulators then you're on my shitlist.