Instead you just "lose" music on your ipod willy-nilly.
Amazon apologized; it's unlikely they'll delete books again. I trust them more.
I suspect because it's difficult for them to technically do so. They would have pulled the GV Mobile app in an instant, if they could have, but the iPhone OS doesn't have this capability. The Kindle does.
Actually, they do have this capability, but they haven't used it.
Why would it be technically difficult for Apple to remove apps from your phone? Implementing a backdoor in your own software is fairly trivial.