Is it what one could set up using a car-FM audio adaptor? I remember it was possible to pick someone's music on your car radio when waiting at the traffic light

Is it what one could set up using a car-FM audio adaptor? I remember it was possible to pick someone's music on your car radio when waiting at the traffic light. Peer-to-peer wifi technically could be an alternative path but is more binding and exposes MAC address and other details unlike FM which is mostly private for receiver.