Sounds like this New York Times article: https://www.nytimes.com/interactive/2018/12/10/business/location-data-privacy-apps.html https://www.nytimes.com/intera

Sounds like this New York Times article: https://www.nytimes.com/interactive/2018/12/10/business/location-data-privacy-apps.html https://www.nytimes.com/interactive/2018/12/10/business/loca... Edit: or actually I was thinking about this article, One Nation, Tracked: https://www.nytimes.com/interactive/2019/12/19/opinion/location-tracking-cell-phone.html https://www.nytimes.com/interactive/2019/12/19/opinion/locat... Which is one in a series they did after some employees of a data broker or digital ad company (if I recall correctly) leaked a dataset to the New York Times because they actually were concerned about this kind of dataset existing.