Apple has updated its developer guidelines for Sign in with Apple and the Kids category. Sign in with Apple is the feature that allows users with an Apple ID to sign in to third-party apps and services with that Apple ID and password. Apple's update alters when apps listed in the Apple App Store are required to use the Sign in with Apple Authentication feature. Apple had previously updated guidelines for its Kids category to better protect children. The original deadline was September 3, but Apple has extended that deadline and offered to help developers make the transition.
Under new guidelines, Apple's default position is that apps listed in the App Store must use Sign in with Apple. Certain exceptions apply to company's that use their own account setup and sign-in systems, education/enterprise/business apps that require users to sign in with an associated login, apps that require government or industry-backed identification login credentials, and apps that require a specific third party login (e.g. a game that operates only on Facebook could use Login with Facebook). Even apps that have their own login service (e.g. Facebook, Google, Twitter, LinkedIn, etc.) are required to offer Sign in with Apple as an "equivalent option." Read the guidelines to learn more.
In June of this year, Apple announced new developer restrictions for the Kids category. The new guidelines state: "apps in the kid's category and apps intended for kids cannot include third-party advertising or analytics software and may not transmit data to third parties." All new Kids category guidelines can be found in guideline 1.3 and 5.1.4. New apps must abide by these policies right now. Existing apps now have until March 3, 2020, to come into compliance.