If an app supports the IndieAuth protocol [1] for the purposes of authenticating the user's primary account, would that be considered "a third-party or social l

If an app supports the IndieAuth protocol [1] for the purposes of authenticating the user's primary account, would that be considered "a third-party or social login service" and be forced to also support "Sign in with Apple"? It is third-party in the sense the user (who is a third party from the perspective of the app) is supplying the authentication service, but it's not a pre-existing social login. It's likely that the IndieAuth protocol wasn't on their radar, and so they haven't considered it when coming up with this rule. [1]: https://indieauth.net/ https://indieauth.net/