Afaik, a random WiFi wouldn't be able to exploit local-execution bugs - it would have to use remote exploits, which are harder to pull off, or limit itself to n

Afaik, a random WiFi wouldn't be able to exploit local-execution bugs - it would have to use remote exploits, which are harder to pull off, or limit itself to network eavesdropping. USB drives, on the other hand, can trigger execution with local privileges - as well as exploiting bugs in hardware-handling system code, of which there are always plenty.