Hey I can shed light on this. It’s the iCloud keychain. Disabling the keychain doesn’t delete existing entries. There is no way to modify the keychain on iOS (you can on Mac). Lots of apps store sign on data in the keychain for obvious reasons.
It would be really great to have a keychain section in iOS’s settings, like Keychain Access on Mac. The dev can build in-app functionality to delete keys from the keychain, but there’s not a huge incentive to.
Keychain storage doesn’t let FB track you, just store sign on info, keys, and the like. It’s not able to execute arbitrary code, it’s an encrypted place to store login info that Apple syncs between your devices.
Use them via Safari if you don’t want this (then your logins are saved & synced in Safaris keychain.)
It would be really great to have a keychain section in iOS’s settings, like Keychain Access on Mac. The dev can build in-app functionality to delete keys from the keychain, but there’s not a huge incentive to.
Keychain storage doesn’t let FB track you, just store sign on info, keys, and the like. It’s not able to execute arbitrary code, it’s an encrypted place to store login info that Apple syncs between your devices.
Use them via Safari if you don’t want this (then your logins are saved & synced in Safaris keychain.)