I don’t even connect my phone to MY car.See also: rental cars and their oh-so-helpful automatic Bluetooth stereo connections.
You could be sharing more than your music playlist.
It’s less to do with high-tech data thieves than the fact that I noticed you can often hear the part of the conversation going through the speakers OUTSIDE of the car. Sometimes from several feet away.
No, that’s not really an issue when the car is in motion. But if I’m parked? That’s potentially a breach of attorney/client privilege.