They are selling more than double the amount of stuff they were 5 years ago, and are over half of US ecommerece. You might care about getting a fake charger, but 90% of people don't give a crap if it's 30% cheaper than the real thing and magically appears at their house the next day.
https://www.macrotrends.net/stocks/charts/AMZN/amazon/revenu...
I think AWS and retail/AFT are basically two different companies. I don't think what happens in one reflects on or affects the other, at all.