It cannot self-propagate to any Android-based head unit
Remember that not that long ago viruses spread through floppy disks.
Today, people share USB sticks full of music from one car to another all the time. They also bring their music from their home car to a rental car and back.
Most people just bring their phone between cars for music.
I’ve never met anyone irl who used USB sticks full of music. I know the capability is there in most cars, just never seen it. It seems like Bluetooth capability and Spotify/Apple Music landed in mainstream cars too soon after “play MP3s from USB” was added, for that to catch on.