>things get messy if pizza shows up on the door because some "device" decided you should have pizza
it will happen anywhere, even if you wouldn't have any "devices" in your home, the "devices" present around, outside of your control, will learn enough about you, and the Big Pizza will buy those predictions to make sure that once you decide to have pizza it is already at your doorsteps waiting. Of course, the same machinery will be used to place police officer right where and when you decide to speed a bit over the limit. They will know you better than you know yourself.