The only thing Amazon does is artificially inflate their rating up regardless of the individual reviews.

https://www.amazon.com/Rain-X-RX68106-ICER-WASHER-FLUID/dp/B...

This wiper fluid is known to cause expensive failures for rain wiper fluid sensors but it has a cheerful 4.6/5 aggregate rating, despite the numerous 1 star reviews saying the product broke their car.