And while you're dreaming that purchase history solves that, the scam world has long moved on.
Currently, companies pay people to buy items. They can keep those items, they just need to leave a good review. There are intermediaries who handle lots of sellers, so people buy a mixed bag of random garbage in exchange for the occasional review.
Yes, you can probably test for statistical anomalies, but I'm willing to bet that's quickly countered too - just have people buy occasional legit items so their profile is "statistically normal".
As far as I can tell, Amazon tries to fight that by keeping their ML model secret so scammers don't learn too quickly, but essentially, they're currently finding out what the Internet learned about SEOs manipulating search results.
Currently, companies pay people to buy items. They can keep those items, they just need to leave a good review. There are intermediaries who handle lots of sellers, so people buy a mixed bag of random garbage in exchange for the occasional review.
Yes, you can probably test for statistical anomalies, but I'm willing to bet that's quickly countered too - just have people buy occasional legit items so their profile is "statistically normal".
As far as I can tell, Amazon tries to fight that by keeping their ML model secret so scammers don't learn too quickly, but essentially, they're currently finding out what the Internet learned about SEOs manipulating search results.