Does this include the newer Apple Axx series units with increasing number of ML cores? Siri is supposed to run locally on device. Hardware is moving explicitly in this direction. If this is done locally, no actual voice data would need to be sent down the wire. Insstead, a small compressed bit of text on keywords could be sent whether that's immediately or saved up until user foregrounds the app. No tinfoil hat needed to see how your premise is pretty weak.