I've noticed that.

If you were just doing car to car communication for automatic driving and didn't need to send ads, track, or remotely update the car, the way to do it would be through the vehicle radars. That's how aircraft send altitude, ID, and anti-collision data back to the ground and to each other. Since you know the range and direction of the signal source, totally bogus signals are readily detected. Doesn't even need a permanent ID; choose a big random number at each start.

But no. The anal probe approach is essential to so many business models.