I am afraid you are making some irrelevant statements like the following instead of explaining your situation thoroughly. If you believe Google or Amazon is somehow involved in rejection, why don't you contact them?
The app is the iOS client of a web service that has been live since 2025 with an active community of a few thousand registered users. The same app got recently published on Google Play.
Our server records show the demo account we provided in App Review Information was never signed into during the second review (no auth event, no SDK session). Everything the review notes point to is behind sign-in.
It means you are greeted by their spam bot. Their intention is to harass and intimidate you especially when you already have one or more submissions waiting for review. There really is little that you can do other than to take down that existing submission or to ask a government (FTC) to step in and have them investigate Apple, Inc's practice.
Topic:
App Store Distribution & Marketing
SubTopic:
App Review
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