You’re absolutely right. There was definitely some quid pro quo going on between Amazon and Apple. Amazon took the stance of not allowing streaming boxes that didn’t have Amazon Prime Video to be sold on the Amazon marketplace, then later pointed to Apple and said they’re the ones not allowing it. The truth is that Apple wouldn’t allow it under whatever terms Amazon proposed. Amazon was then able to strong-arm Apple to make an exception to their policies.
The infuriating part is that developers and consumers suffer consequences due to closed-door agreements between giant corporation A and giant corporation B: Apple and Amazon, in this case. If Amazon wanted to be competitive and Apple wouldn’t make an exception to their policy, Amazon would have taken legal action to be able to distribute their software and services to Apple customers independently of the App Store. But instead, Apple squelched the possibility, Amazon wins, and the little people are left at a loss of healthy competition.