Tracking Phones, Google Is a Dragnet for the Police – The New York Times

The tech giant records people’s locations worldwide. Now, investigators are using it to find suspects and witnesses near crimes, running the risk of snaring the innocent.
— Read on www.nytimes.com/interactive/2019/04/13/us/google-location-tracking-police.html

The key point is that you’re putting your location data in a repository that is subject to subpoena.