1. Licence plate fraud; duplication = speeding + parking fines under your name. Even though tons of people see your plates whilst you're out on the roads.
I dunno, it just seems completely daft to me. My number plates are visible to thousands of people as I drive around, and hundreds of people via all the CCTV cameras in our cities. It's just completely ridiculous and irrational to blur the numberplate on a photo when it's plainly visible all day, every day, to all and sundry.
JVS, you can safely dump the paranoia!
There is no logical reason for it.