I imagine it's much easier to skirt the rules on eBay for exactly the reason you state.
Amazon, on the other hand, moderates customer reviews, so when I see a one-star rated "16TB SSD" with multiple reviews explicitly pointing out the fraud while it continues to be sold, I can't help but wonder if Jeffy is just looking the other way.
Then again, maybe the review moderation team is only looking for off-topic comments or profanity and hasn't been tasked with fraud reduction.
I think much of the ratings on Amazon are a complete joke. I've been contacted, unsolicited, by what I assume are Chinese vendors to buy their products, review them, and get a refund.
After refusing to go down the rabbit hole with one -although I did buy the product, an HDMI switch, because I needed one - Amazon then refused to let me review the product and said I broke some rule but would not tell me what I did wrong (I acted ethically). After prodding them a bit, I was told they would no longer respond to any more inquiries about the subject, and still refused to tell me what "rule" I broke.
Pretty screwed up that the vendors are allowed to contact you, unsolicited, and make you offers in private to review their products.
Now, if I purchase something unsolicited, review it, and the vendor then offers me a discount or partial refund (happened once, some printer ink) then I'll gladly accept it.
Of course I read the reviews as well, I'm just a little more careful these days as I've got some real junk a few times.