It has been clear for a while now that many data sets can be "de-anonymized" be they tax records or particularly location data. I have seen fitbit "anonymized"

It has been clear for a while now that many data sets can be "de-anonymized" be they tax records or particularly location data. I have seen fitbit "anonymized" data of my own movement about our farm, of my wife's typical running route through our woods, of patrol routes around fire bases overseas and even movement of analysts within the pentagon. Is it creepy, to be sure yes, but honestly it can't come as a surprise to you as a member of a "hacker news forum" that dozens of popular 3rd party apps collect and sell your location data "to improve your experience". Apps that you and I and more or less anyone else told "go ahead and collect this data and sell it to your partners".