Ignoring of course the fact that the most important parts of Android is not open source (Google Play Services, which is at the centre of a very misguided EU anti trust case), just because Android is 'open' it doesn't mean you can do more things on it. If something is possible on Android that's because of a design decision that Google took. Besides, what happens when you run iNot someone that you can't so on Android? You going to download the source code and make a change and flash it to your decide? I doubt it.