I don't expect final users to read Amazon/Apple/Google guidelines but I do expect that from devs and publishers.
Apps don't need to login with Apple ID (unless they provide auth with a 3rd party service). The device is logged and every app downloaded contains a "list" with all purchases associated with them.
You, as a dev, need to verify that these purchases were not tampered by checking each purchase against apple. But you don't need each app with IAP to request you your Apple Id to validate your purchases. That's insanity.
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