> In the Google case, users have a private relationship with Google where they elect to let Google track them and retain their information... but when the Police ask for that information it's a 'search' and requires a specific warrant.

Bigcorp has a tendency to treat "anonymized" data as if it were up for grabs. The moment they strip the obvious PII from a data stream, they consider it anonymized, and they can do whatever they want with it. They "value" your privacy--that anonymized data is gold. Of course, such data is such high value and they don't "sell it to third parties", so they technically uphold their pages-long EULA, should they ever be charged in court.

But the nature of a lot of high value information, like fine-grained location and telemetry data, just cannot be effectively anonymized. I mean, how do you think they get real-time traffic information? It's "anonymized" GPS location / speed data from Android phones. And it is from the location services layer, not from Google maps.