According to the App Store update guidelines provided by Apple to developers, Sign In with Apple is a mandatory feature for all apps offering third-party login options.
This implies that if an app allows users to log in with information from Facebook login or Gmail login, Google must also provide the Sign in with Apple option. Developers will not be required to provide Sign In with Apple if logging in with usernames and passwords.
Sign In with Apple authenticates users using Face ID or Touch ID, ensuring the safety of users' personal information and respecting their privacy. The feature is designed to allow Apple users to create a new account within the app with just one click without compromising user data. Refer to how to install Face ID on iPhone X here.
Additionally, Apple's new login feature allows users to generate randomly created email addresses, concealing the email address when they log in to apps or services.
https://Mytour.vn/apple-introduces-sign-in-with-apple-new-feature-25013n.aspx
According to Craig Federighi: 'As each app will have a random and unique address, this means you can disable that app anytime.'
