But the ban, sellers and experts say, merely pushed an activity that used to take place openly into dispersed and harder-to-track online communities.

 

There, an economy of paid reviews has flourished. Merchants pledge to drop reimbursements into a reviewer’s PayPal account within minutes of posting comments for items such as kitchen knives, rain ponchos or shower caddies, often sweetening the deal with a $5 commission or a $10 Amazon gift card. 

Amazon says it aggressively polices its platform for incentivized reviews. Amazon has filed five lawsuits since 2015 against people who write paid reviews and companies that solicit them.
 

“We know that millions of customers make informed buying decisions everyday using Customer Reviews,” an Amazon spokeswoman, Angie Newman, said in a statement. “We take this responsibility very seriously and defend the integrity of reviews by taking aggressive action to protect customers from dishonest parties who are abusing the reviews system. . . . We take forceful action against both reviewers and sellers by suppressing reviews that violate our guidelines and suspend, ban or pursue legal action against these bad actors.”