[ska]

   it’s the same as if a person standing on the street saw your plate and told someone else. 

It really isn't though, is it? There is a bunch of policy and law here that remains to be worked out, but large scale ubiquitous surveillance and storage of your public "footprint" is really not the same thing as a person having been able in the past to follow you around and take notes.

This is one of the areas where scaling really matters, and you can do many things with these sort of databases that were simply intractable before. So I find the conceit that it is "just the same" to be inept.

I don't know where the courts and legislators are eventually going to arrive at on this, but if it is as cut and dried as you suggest then you can look forward to a near future where anyone who cares to can buy a detailed dossier on all of your movements for the last decade, say, with known and inferred contacts, assets, etc. It probably won't be very expensive.