Comment by laksdjfkasljdf

btw, when you install any app on Android, it sends a huge hash (maybe the whole thing) to Google servers.

Try to install an apk without internet connection, and then try over a slow 3G connection to see the several(!) minutes it takes.

If your phone has the old style data arrows, you will see the upload one all the time while you stare at the "installing" screen.