No problem, you make the fail-safe mechanical spring pull the throttle blade open for an aircraft if motor control fails instead of closed which is what is done on a road vehicle.
Exactly. But the same principle is applied throughout the design.
That's one of the reasons that magnetos are still used as well. Magnetos require a short circuit to be shut off. If the wire from the magnetos, through the firewall to the magneto switch breaks off for whatever reason, the magnetos are live.
Other examples are thermostatic valves in water-cooled engines that fail towards the setting that pushes the water through the radiator instead of bypassing it, and prop governors that fail towards fine pitch (in single engine airplanes) so that full power/RPM is available.