Have you ever wanted to use Anonymous Sing In in your app?

With Firebases new Anonymous Auth you can ease the pain of your users to give you there email and set up their password. All that they will need to do is tap on one button.

Welcome to the fastest sing up process ever: no email, no password required.

Learn Firebase Passwordless Sign In with Swift 5 and Xcode 10.2.

You can use Firebase Authentication to create and use temporary anonymous accounts to authenticate with Firebase. These temporary anonymous accounts can be used to allow users who haven't yet signed up to your app to work with data protected by security rules. If an anonymous user decides to sign up to your app, you can link their sign-in credentials to the anonymous account so that they can continue to work with their protected data in future sessions.

Firebase Passwordless Sign In is perfect way to not make your users remember passwords!