There are groups that do both: buying the first batches of products and writing nice reviews, then the seller will pay for what they have done, it's a mature bu

There are groups that do both: buying the first batches of products and writing nice reviews, then the seller will pay for what they have done, it's a mature business these days: you hire a team to market you at Amazon by faking reviews after "real" purchases(will be compensated or rewarded under the counter afterwards). This is very hard to detect indeed. Maybe Amazon can have some AI algorithm, that is for any newly arrived products with non-sales yet, monitoring the activities on them closely,the fake purchase and review must have some common pattern(same address, same ID, same IP,etc). But then, why does Amazon want to do that? it will decrease its own profit. So yes, customers will be the one got screwed up no matter what.