There was a period when automated red-light cameras were really popular with municipalities, followed by significant backlash. Since then, the companies selling them have not recovered financially and the cameras never regained popularity. It could happen with Flock, too.

I believe much of the backlash was the fact that companies were bribing municipalities and the majority of fines collected just went to the private companies themselves; https://www.cbsnews.com/chicago/news/former-red-light-camera...