needs to sign in, and allows the user to view and manage their relevant account details. Any subsequent visits to an app can be handled on device without sh...

https://www.apple.com/jp/privacy/docs/Sign_in_with_Apple_White_Paper_Nov_2019.pdf

of their devices, view location, text messages and contacts, steal users’ login credentials, and make changes to users’ phones.12,13,14 Others have been use...

https://www.apple.com/jp/privacy/docs/Building_a_Trusted_Ecosystem_for_Millions_of_Apps.pdf