Question: Why authRepositoryProvider watch FirebaseAuth.instance?

[gothedistance]

In firebase_auth_repository.dart, authRepository watch firebaseAuthProvider.

@Riverpod(keepAlive: true)
FirebaseAuth firebaseAuth(FirebaseAuthRef ref) {
  return FirebaseAuth.instance;
}

@Riverpod(keepAlive: true)
AuthRepository authRepository(AuthRepositoryRef ref) {
  return AuthRepository(ref.watch(firebaseAuthProvider));
}

Llistening to FirebaseAuth.instance using ref.watch.
This implies that there could be changes FirebaseAuth.instance itself.

Does FirebaseAuth.instance actually change automatically?
FirebaseAuth.instance implements static get, object id will not change.

I would like to know if there are cases where performing operations with Firebase Authentication results in changes to FirebaseAuth.instance.