Rather than worry about this little tracking peculiarity, my mind wanders to a future where the govt is smart/capable/evil enough to be connecting all the cameras in buildings, cars, etc. into one place that constantly monitors for license plates and is able to tell:

-- anyone who has been driving around with a car registered in another state but hasn't relocated it to that state within a month (avoiding taxes -- CA I'm looking at you)

-- backtracking where someone who committed a crime came from, and has gone

-- etc.

Maybe somewhere this is already being done.