I don't think Apple would, or even could ban anything of the sort. I think they want people to develop for iPhone first, and if you want to automatically convert that code to Android and get the cross-platform inferior experience there, then so be it.
I agree with this as well... I'm sure Apple wants more apps for the Mac, and if someone were to create a 3D modeling tool targeted for iPhone apps that could produce cross platform Android apps, they'd welcome it into their Mac family.
