https://techcrunch.com/2019/06/03/apple-will-soon-require-apps-with-any-third-party-logins-to-use-its-new-sign-in-with-apple-service/

Something from the fine print out of today’s WWDC keynote. Sign In With Apple didn’t get a ton of time on-stage today, but it should prove a nice new feature for the company — and for those concerned about handing over sensitive information to third-parties.

Turns out it will also be required for app developers utilizing any sort of third party login service. If they offer social logins or other third party options, they’ll have to offer Sign In With Apple as an option.