How to stop an app from tracking your location
Quick answer
To stop being tracked by an app, set its location permission to While Using or Never and disable background access. Better still, use apps that check location on-device so nothing is transmitted.
Start in your phone settings. Set location permission to While Using or Never, and turn off Background App Refresh for anything you do not trust. On iPhone, check Precise Location too. For the apps you keep, prefer ones that process location on the device rather than sending it to a server. That single design choice decides whether your movements ever leave your phone at all.
In one sentence
Parages pings you when you pass near a friend. It tracks nobody.