Case in point, emulators have been available on the Android store pretty much forever and as long as they keep it clean by not distributing copyrighted ROMs or

Case in point, emulators have been available on the Android store pretty much forever and as long as they keep it clean by not distributing copyrighted ROMs or BIOS files directly in the app it's never really been an issue. Nintendo probably doesn't like it but they have no cause to have them taken down.