Not because it’s Apple, but rather because Apple are exploiting their position as iOS App Store gatekeepers to require developers to add Sign In With Apple. Mozilla don’t have this position / power.
I think people would have the same issue if Google required ‘Sign In With Google’ in play store apps that have Facebook login, and returned throwaway / proxies email addresses.
I think people would have the same issue if Google required ‘Sign In With Google’ in play store apps that have Facebook login, and returned throwaway / proxies email addresses.