Apple allows you to use a feature called "Hide My Email" so that when signing in to services using your Apple ID, the provider never sees your actual email address.
When you sign in to Fade In Access using Sign In With Apple and your Apple ID, Fade In will only see you as random-id@privaterelay.appleid.com.
If we ever need to look up your account, we will be unable to do so using your actual email address/Apple ID. Instead you will need to provide us with the private relay address that Apple is using for you to sign in to Fade In.
You can look this up being used for Fade In sign-in by following these instructions from Apple: