Microservices fail when the engineers involved only focus on the how, and disregard the "what" and "why" parts. If there were tightly coupled microservices in the Amazon Prime Video architecture, no wonder it failed to be an adequate solution.
Microservices should be loosely coupled. Each microservice should be unaware, as far as possible, of the existence of other microservices. Each microservice should "think" it's the only service in the world.
They should have followed these principles instead:
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