Today, on #HumanRightsDay the NYTimes released multiple articles on the practices of location tracking companies. Here is their 23 min Podcast: https://nyti.ms/2PrURyl to get you started, the corresponding article: https://nyti.ms/2RIZMgd and more detail about the technical analysis of the location tracking companies: https://nyti.ms/2zLYoTl
And most important, how to stop your apps from tracking your location: https://nyti.ms/2QrPLrt