Comment by j45

Is it still the case that offering Apple ID is mandatory on the iOS store?

Forcing users to use certain identity providers while uninformed as a sole point of failure is a challenge.

Apple (or other providers) already have the user with an ID, having the app do the bidding of propagating it's use further is a different issue.

If it was optional, and a convenience/preference that could be added, that would be a different thing.