Exactly. Even if there were police around they won't know the difference between most bikes so won't know whether plates are cloned. It's harder on a car to clone a plate because you need to find a "red mini" or "white fiesta" or whatever to match your own car. But with a bicycle it will probably just say "bicycle". So a huge number of plates will simply be cloned. Everyone will be cycling around with copies of the 10 genuine plates that were issued.Well if there was a camera and they had a number plate...
I'm sure there would just be dodgy plates though, and it's not as though there are any police around.