That's harder to game, because while a seller certainly could post a negative review citing some irrelevant flaw (and I have seen that), and hope that triggers buyers who don't care, they won't stop other people (like me) from posting negative reviews too, and what I'm looking for is products with a reasonable number of negative reviews where there is an absence of reviews mentioning things I care about.

I also know first hand from selling a novel on Amazon that you can perfectly well gain honest reviews in ways allowed by Amazon, and I also leave a reasonable number of reviews on Amazon myself, so I have every reason to expect at least a portion of the reviews to be honest.

Overall I've managed to avoid buying anything that appears to have been fake from Amazon, despite having bought a couple of thousand products at Amazon over the years (based on the order page stats, and taking off a few hundred as an estimate of digital only products)