I worked on this at Amazon a long time ago. One of the goals was to identify and consolidate items that were the same but where sellers intentionally (or accidentally) had split the listing. Amazon has lots of internal metrics showing how correctly matching listings reduces prices for customers and increases sales. Something like 5-7 listings was enough to find a market minimum.

The achilles heal for sellers is that their listings ultimately need to show up When searching for unique information specific to a particular product. They’ll often try to hide that in an unrelated field or in the description. Usually a seller uses the same “trick” for all their listings.

> The achilles heal for sellers is that their listings ultimately need to show up When searching for unique information specific to a particular product. They’ll often try to hide that in an unrelated field or in the description. Usually a seller uses the same “trick” for all their listings.

By unique information, do you mean descriptive adjectives or product features? If so, these terms more often than not show up right in the title:

ProBien Case for iPhone 11, Liquid Silicone Phone Cover w Tempered Glass Screen Protector, Shockproof Durable Protective Rubber Cases Full Body Drop Protection 6.1 for Women Girls-Wine Red

60 Pack Guitar Picks,Cowalkers Abstract Art Random Color Celluloid Guitar Picks Plectrums Unique Guitar Gift For Electric, Bass & Acoustic Guitars Includes 0.46mm/0.71mm/0.96mm

COMFEE' Rice Cooker, Slow Cooker, Steamer, Stewpot, Sauté All in One (12 Digital Cooking Programs) Multi Cooker (5.2Qt ) Large Capacity. 24 Hours Preset & Instant Keep Warm

All of these items were on the first page of results for a single term (iphone 11 case, guitar pick, pressure cooker) so not only is Amazon failing to enforce TOS rules and guidelines against keyword-stuffing, the trick clearly works for sellers.

Amazon and Ebay facilitate fraud on both sides. Amazon, as with Ebay, automates customer complaints to the point of almost no due diligence. There are some very high profile schemes of fraud on the side of buyer where they either claim damages, lost packages, or return empty boxes that force sellers to send replacements or refunds.

Personally I've been able to ask for refunds on Amazon through a 5 minute chat dialogue for products that were months out of the return period (I felt it was in my case because the seller wouldn't honor warranty etc, but this ease of refund/return is abused rampantly on both Amazon and Ebay by buyers).