That’s great news. I never use apps that force me to login with either Google Facebook or twitter. There should always be an option to login with an email address and Apple’s login with disposable non personal email is really easy and useful.
This should be cheered by all.
This is a massive step back in progress. I weep for everyone stuck in a single company's ecosystem. You will be abused before it's over.
You're free to roll your own sign-in system, in which case you are not required to offer Sign In with Apple.
Not seeing a problem here.