Funny coincidence - I went to see a talk by Rich Benoit (of Rich Rebuilds fame) just the other day. Rich used this security loophole to find the key for one of the donor cars that he used to build his franken-tesla. After he swapped the electronics from a crashed car into a water-damaged car he was able to power it up enough to get the navigation to work but couldn't drive it without a key. The previous owner's house was still listed as "Home" in the nav system so he was able to get in touch with him and get the key.