This is irresponsible conjecture. AWS has very strict privacy and data safe guards in place. There are a number of laws (particularly in the EU) that forbid such practices.

https://aws.amazon.com/compliance/data-privacy-faq/

The reason AWS is successful is because Amazon takes privacy and security seriously. Why does Netflix trust AWS when there's Prime Video? Because Netflix knows that they have legal recourse against Amazon if they tried to do anything underhanded. I suspect Amazon would quickly fire anyone who breached customer data.