My first thought was what about vigilanti'ism or targeting someone?
The potential is there for someone who is 'playing this game' to either decide they're not going to report it but to deal out their own justice or spot someone innocent who they don't like and learn some of their habits.
Someone somewhere is going to end up watching a camera in a shop/area that is local to them. Whats to stop some thief watching it, making a note that Mrs Smith always walks to get her pension every thursday at 1000. They know how long it takes for her to walk there and back, they know how long the house is empty for!!!
There are many more scenarios we could all come up with, none of which give this idea any merit at all.