Happy that I have found this site. Over 2 months did not receive any fines. Seen few times camera flashing, but no letters so far.
The license plate is fully readable for police insurance radars, the "Anti Fine" film only protects you against the Speedcameras. When the speedcamera will try to take a picture of your number plate, some of the numbers will be flashed and "Fine Letter" will never find you again.