While possible to package Ren'Py games for Android, it's hardly worth it outside of very simple VNs. That's why you don't see other people doing it. Then you're stuck trying to troubleshoot dozens of different systems why, who knows, maybe Ren'Py just doesn't play well will that particular device.
I'd also most likely have to redesign most of the interface. Most importantly in my case, though, is the fact that different devices and different versions of Android handle movies in Ren'Py very differently--and my understanding is none of the them handle them very well. So, yeh, don't expect an official Android release any time soon.
But, hey, the files are out there for anyone to unpack. If someone wants to give it a shot be my guest.