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Analogies are terribly leaky abstractions: a camera set up to watch cars on a busy highway can absolutely draw conclusions, doubly so if there are multiple networked cameras, and if the camera can see a license plate it's game over.

A more realistic analogy would be "a camera monitors a busy road where all cars are replaced by identical black cubes with no windows, and a 256-bit license plate whose value is set entirely locally, is not known to anyone but the occupant of the car, and changes unpredictably on the hour". Can you track a car in this world? Sure, but it would require significant data collection and analysis and would almost always end up probabilistic at best.

Is this analogy useful? You decide. No, it is divorced from observable reality. Yes, because it avoids misunderstandings like "you didn't intend for your analogy to include license plate scanners but your audience assumed it possible".