In response to a request for comment, an Amazon spokesperson shared the following:
“There’s no place for fraud in Amazon’s store. We have proactive measures in place to prevent listing abuse and we continuously monitor our store. Our policies prohibit reviews abuse including offering incentives like gift cards to write positive reviews. We suspend, ban, and take legal action against those who violate these policies and remove inauthentic reviews,” they said. “Amazon receives millions of reviews every week globally, which are analyzed before publication by our skilled investigators and sophisticated industry-leading tools. More than 99% of products viewed by customers in our stores contain only authentic reviews. Amazon will continue to assist enforcement agencies in holding bad actors accountable, including the FTC.”
What a load of absolute BS!!!
99% of products contain only authentic reviews…are you kidding me!!
Boy would I love to publically dispute that, in just a couple of hours I can find dozens of fake and hijacked reviews. Maybe I should make a video… 
We suspend, ban, and take legal action against those who violate these policies and remove inauthentic reviews..
I’ve seen numerous sellers (especially newly launched accounts) that have been reported for hijacking and blatantly stealing reviews from another listing (some that I have personally reported and tracked) and they are still actively selling. All Amazon does is remove the reviews.