"... this CO scheme wouldn't be legal here in CA..."
It would not be legal in Texas either, but legal is what a judge says it is. Judges aren't there to find you not guilty.
Earlier in my life I had a friend whose father was a prosecutor. He claimed his father had never lost a case and couldn't understand criticism how that result was not something to brag about. Turns out his father was a personal friend of the judge that tried his cases and served as a temporary judge in that same court when the judge wanted time off. He thought this level of corruption was a point of pride. Texas, although likely occurs everywhere.
Speed limits are set to ensure a ready supply of people to fine. The more effective and automatic enforcement is, the larger a problem there is going to be with the public. Local government basically steals whatever money it wants while officially looking good to the voters by making the "bad guys" pay for things. That will end when the "good guys" get fines in the mail.
Society seems to be engaging in a race to ruin its infrastructure.