I don’t agree with the assertion that fake reviews don’t benefit them, but I may be missing something. Reviews help drive consumer behavior and more reviews lead to more sales from those who are unable or unwilling to be more discerning. (Amazon takes a cut)

For others, it the idea or presence of fake reviews might drive them to a “trusted” Amazon Basics alternative, also leading to sales with a higher margin for Amazon.

Additionally, recycling listing ASINs is a common tactic that Amazon could stop and is a source of “fake” (or at least, irrelevant in content and misleading in score) reviews. There’s minimal enforcement of rules for review integrity, such as verified purchases or quid pro quo “warranties” and “free gifts” for 5 star reviews.

All the evidence I see points to Amazon preferring the status quo.