Nullslash

it's a privacy issue. Users who enable the feature don't understand that are basically publishing thier latitude longitude online. Which can be resolved into a home address.

Your location will be shared on the map if you make yourself visible. Otherwise, you're safe. Disable location sharing for the whole app.

Author here. No, that is called z-coordinate. It's not possible to get z-coordinate by just finding the distance between me and the user.