What do you do with the users' location history on the server side? (Obviously you see it to be able to know who to send push notifications to...)

Is it stored? Logged inadvertently? Intentionally archived? Intentionally purged?

We don’t store users location history. User's device only sends its geolocation and we use it simultaneously under messaging. All geolocations are erased by newer ones.

How do you access the users location? Wifi? The app doesn't ask for this permission and there's no such permission in the settings tab.

You probably haven't finished tutorial mode. After the tutorial Nod will ask to turn on geolocation access.