Honest question: how open is Android? I mean, when you consider Play. Can you write/submit an end-user programming app like Scratch? I know we can always dev-unlock the device and install anything we want, but what about the kid with an Android tablet who wants to start hacking?

I'm worried about this move to walled gardens on all the platforms. The desktop is one of the last bastions of openness, but its not really evolving. Could we have cake (openness) and eat it to (app store where devs can make money, at least easily distribute their possibly creation-oriented apps)?