Sure, and companies could also sue you for libel when you leave a negative product review. Life is unfair, but when talking strictly about what's legal or not,

Sure, and companies could also sue you for libel when you leave a negative product review. Life is unfair, but when talking strictly about what's legal or not, homebrew roms using an emulator that has a clean room implementations of BIOS should be perfectly acceptable for the App store legal-wise.