Reading this thread, it seems some people think the problem is that it is legal to record stuff in the open. IMHO, that is the wrong take on it.
Let's take license-plates. I don't mind that a police officer is able to see it and note where I am at a given time. But it becomes something quite different when we have surveillance-systems recording where every car is all the time. I do mind that.
It is the systems that are scary and ripe for abuse, not individuals.