I think it comes down to quantitative differences resulting in qualitative differences. It's not unreasonable for anyone (public or police) to notice when I am

I think it comes down to quantitative differences resulting in qualitative differences. It's not unreasonable for anyone (public or police) to notice when I am out in public, and what I do in public. But at some point an accumulation of these OK interaction becomes not OK, in the same way we already recognize that an individual simply seeing somebody in public is a protected right but stalking is not. When the technology exists to track everything I do in the public sphere, catalog, summarize it, and sell it for profit, we are dealing with a qualitatively different animal that has entirely different implications morally and with respect to our rights as individuals.