I'm not sure I follow - just capturing packets from them tells you how much they're sending to their respective motherships, e.g.[1].

Amazon of course is not exactly conspiring to try and get me to buy more stuff from them (they're very upfront about it), which makes them both more crass and also easier to trust in some ways than Google.

1: https://www.iot-tests.org/2017/06/careless-whisper-does-amaz...