Since around 2016 Apple does not expose a stable unique identifier to apps. Users can reset their identifier at any time, opt out of location-based and personal

Since around 2016 Apple does not expose a stable unique identifier to apps. Users can reset their identifier at any time, opt out of location-based and personalized ads. Apps submitted to the store must follow those guidelines. There is a lot wrong about their policies but you have to give it to them for respecting privacy: https://support.apple.com/en-us/HT205223 https://support.apple.com/en-us/HT205223