There is a third-class of one-star reviews. Opposing businesses posing as disgruntled customers.
Shipping problems.
People will receive a box that looks like it fell off the truck and then got hit by every car that was driving behind it, and then leave a 1-star review on the item.
This is a super simple problem to solve technically (just require manual review when more than 10% of the description text changes), proving that Amazon is absolutely complicit in whatever bad shenanigans are happening on their platform.