You need to see what the permission means within the behavior of similar permissions, and that is written in application guidelines for iOS devices. Here's one

You need to see what the permission means within the behavior of similar permissions, and that is written in application guidelines for iOS devices. Here's one way that this app violates the guidelines, hence does something unexpected with the permission: "17. Privacy 17.1 Apps cannot transmit data about a user without obtaining the user's prior permission and providing the user with access to information about how and where the data will be used"