Google is pushing location data to devices and purging it on servers. From a citation within my comment I’ve cited below:
> This change means that Google will no longer respond to geofence warrants from law enforcement that request information on all devices near a particular incident.
> This change means that Google will no longer respond to geofence warrants from law enforcement that request information on all devices near a particular incident.
https://news.ycombinator.com/item?id=40869536
(edit to fix my mistake, thank you Centigonal!)