When one is moving across several disparate geographical locations, there is indeed an expectation of privacy.
The simple "hurf durf you're in public ergo no privacy ever" argument is horseshit, to put it bluntly.
Also, what's "horseshit" about "you don't have privacy when you act in public"? I'm not recording your conversations as you're in public, only what you do. Why is that horseshit?
Because historically (and also legally) the bounds between what is private and public have been defined by what was plausible at the time, not by what was hypothetically possible.
We know live in a world were what used to a be a hypothetical dream (or science fiction novel) has now become the mundane. The law can either adapt (via judicial rulings), be changed by voters or become an absurd anachronism that's good for nothing but justifying invasive surveillance.
It's morally wrong to try and stop me from automatically recording the license plates of the people who drive by my house.
It is more complicated when you start talking about whether you should sell derivations of those recordings or someone aggregating the recordings made by many people.
It's the exact same thing as CCTV, fundamentally. How can you construct an argument that prevents me from doing this without preventing many things we already are okay with?
There is also the problem where you are talking about morality as if it is clear cut and all settled.
Anyway, I'm pretty well in favor of trying to find a meaningful definition of a space that exists between public and private, where shared space activities are not just a free for all. Mostly, because I think I would/will be more comfortable in shared spaces if I can expect that other people will mostly have some respect for my wish to not be followed around with technology.
(I would argue this space exists, it's plenty easy to irritate someone by 'getting in their face' in public. This is them expressing strident disapproval of your behavior...)
The only point anyone's been able to make is that it could possibly be abused, but frankly, everything the government can do can be abused. You'll need more than "it could be abused" to argue against it.
I don't have a right to go into a place where you have privacy. If you come out of a private place, or act in a way that is public, I have every right in the world to track you.
Personally, I have not trouble tracking every car.