The only right of a Nintendo license is to have their name on the screen saying Licensed to Nintendo, and allowing that game to work on their hardware, use their logos, boxes, and so on, the physical aspect. They don't own a damn thing with any of the games and all one would have to do is remove the 'licensed by nintendo' blip on the title/pre-title screens and you'd be good to go if your 'emulator' was made honestly not using legal old Nintendo docs to make the emulator. It's just developer laziness and disinterest keeping such games off Steam, android, or whatever else. If someone decided it was in their interest to license to ATGames their library and use one of those shitty sub-par buggy emulators of theirs to make another console or handheld they have every right to do so.