I’d say that one month from release, 100 times as many people will know about Sign in With Apple as have ever used Mailinator. And Apple marketing will drill in

I’d say that one month from release, 100 times as many people will know about Sign in With Apple as have ever used Mailinator. And Apple marketing will drill into them why they should use it, and mark apps in the App Store that support it. Eventually for experimental apps that they are not 100% decided on getting, there will be a large fraction of users who simply won’t try an app that doesn’t support it.