I think the big difference here is that people willingly plug their phones into the airport kiosk chargers, share chargers, use car-based usb plugs, and general

I think the big difference here is that people willingly plug their phones into the airport kiosk chargers, share chargers, use car-based usb plugs, and generally don't even think of it as an attack vector. On another note, I've been amazed by the number of people who let others plug phones into their computer for a quick charge. I'll let people borrow my wall charger if I'm sitting there but no one plugs anything into my computer.