This is exactly what happened in Moscow after same tech was launched. It is much 'safer' on streets, since every entrance door and traffic intersection is equipped with cameras now.
But I pick Portugal's approach every time — no public cameras, no dashcams, it is forbidden to record private persons in public without permission.
I’m in Portugal with kids right now and I can not think of a country where dashcams would be more useful.
The standard of driving and adherence to the law of the roads is some of the worst I’ve encountered in Europe.
I haven’t let go of my 9yo’s hand since we arrived in Porto a few days ago. Speeding is chronic and nobody gives a shit for the safety of you or your children here.