How do iOS apps fingerprint your phone?
This is a question mainly for devs as you’re probably more aware of this.
What information do apps use to fingerprint your device? For example Uber, Yik Yak etc store account details somewhere even if the app has been uninstalled. When re-installing the respective apps, they automatically logging in. What information from the device are they using to fingerprint to an account or store login details?
It’s definitely not iCloud, because I have a completely clean iPhone which is only logged into the App Store and data is still stored somewhere even if iCloud is not enabled.
The only way of erasing said data is to erase all contents and settings in General.