From Here (https://www.reddit.com/r/FulfillmentByAmazon/comments/e719xv/how_chinese_sellers_are_manipulating_amazon_in/f9uownv); a comment on an article about Chinese sellers are manipulating Amazon (https://www.ecomcrew.com/chinese-sellers-manipulating-amazon/?fbclid=IwAR3zXCGcUsGsD6rRh84KlvRyZAS5gvFkOY27xd0FhgJZi5-W6DzU-n5WNwI)
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tl;dr
Fake reviews - compensating/reimbursing real customers for leaving a positive review,making fake orders and leaving positive reviews through zombie Amazon accounts, selling fake reviews to others
Zombie accounts - fake review companies (almost always in China) open hundreds or thousands of fake Amazon accounts known as "zombie accounts", they then emulate "real" customer browsing behavior so as not to arouse Amazon's suspicions
Counterfeit products and listing hijacking - no barrier to entry for Chinese sellers to sell counterfeit products on your listing, Amazon does not actively audit items to determine if they are genuine or not, malicious sellers can print a fake UPC bar code, apply it to counterfeits, and Amazon will deem it genuine
Sabotaging competitors' product listings - any seller can potentially edit a listing, cause consumer confusion, and destroy your sales
Variation abuse - any seller may potentially add a variation to an existing product, since all variations in a listing share the same reviews, sellers add completely different products to existing listings to mimic high review counts, Amazon shuts down active listings frequently so sellers target discontinued listings instead
Stealing internal Amazon data - mid to senior-ranking employees within Amazon China have direct access to Amazon's internal network that allows them to access private information related to all sellers, corrupt Amazon employees steal and sell competitor business reports on the black market
Not mentioned, other common strats:
Merged listings - sellers open support cases to merge inactive/discontinued product listings contain high amounts of positive reviews with their unrelated product listings, acquiring high review counts for brand new products
False IP claims - sellers file false IP claims on product listings to shut down your listing, causing loss of sales while Amazon forces you to submit appeal documentation
Product listing sabotage - article failed to cover sellers who will change your product listing to have your listing shut down for policy violations, this may include changing your product images to porn or changing your product category to adult products
Manufacturer disloyalty - Chinese manufacturers will turn around and either resell your private label products to other private label brands on Amazon or sell your products under their own brand on Amazon
Burner accounts - sellers buy old Amazon seller accounts, old accounts have daily bank deposits (as opposed to bi-weekly) and do not hold payments, some sellers use these as burner accounts to mass sell counterfeit goods and deposit funds immediately before they are caught and banned
Multiple accounts - Chinese sellers are known to have multiple accounts and brands at any given time, allowing them to still sell on Amazon after suspensions and bans
Trademark abuse - some competitors will register your brand name as their trademarks, forcing Amazon to shut down your listings for trademark infringement, forcing you to rebrand entirely and start over