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Modern cars command modules on/off digitally over the CAN bus instead of the old 'accessory power' wire or switching the main power feed. The radio is one of many examples of this. That said, there are still fuses that will shut off with the ignition. The power feed for the 12v ports in the front feeds off the lighting relays which means they will stay on for up to an hour or so after the car is off but then shut down. There are a number of fuses that are like this as well even for stuff not lighting related. Here's a thread that has some useful info: