Sorry, wrong. You have no privacy. All newer vehicles spy on you. If your phone is connected to your vehicle for the convenience of handsfree driving, it’s recorded. Where you go, how fast you go, and all around driving habits are recorded. Anything you say in your vehicle may be recorded. Most new vehicles have a wi-fi antenna for transmission purposes.
Bluetooth can’t spy on you anymore then your phone already can.
wifi isn’t the transmission signal, it’d be LTE or 5g antenna’s.
Without a modem, my head unit cannot send any info to anyone unless they can pull it via the OBD port. Which considering I service my vehicles at my shop, no one unauthorized is getting at them.