https://www.wired.com/story/geofence-warrants-google/

Does your app send your users’ location data to Google or SDK companies? These companies store detailed location paths, showing every place your users have been, for years. By doing so, you are putting your users not only at risk of:

  • Entrapment in a geofence warrant
  • Stalking by an employee of the company (which just happened at Facebook)
  • Data theft and gift or sale of the data by an employee of the company (how do you think The NY Times gets data?)
  • Data theft by hackers
  • Subpeonas by law enforcement, angry ex wives, etc.

PathSense privacy: Data never leaves the phone.