I am in fact stating that there is no proof that they do anything to reduce collusions or deaths. I stated in my first comment that such proof does not exist.
These cameras are only deployed to generate revenue. There is no scientific basis for improved safety.
They are restricted. California has an insurance commissioner who has to approve any rate increases. It’s probably easier to stop insuring then to get the rates up to the profitability margin their risk models are suggesting are appropriate.