According to the South China Morning Post (SCMP), Amazon has prohibited the sale of RAVPower power banks, Taotronics earbuds, and VAVA cameras, all of which are owned by Shenzhen-based electronics manufacturers Sunvalley, as of June 16.

The retailer’s license was suspended when it was revealed that they were giving out reward cards to customers who agreed to write positive reviews about their purchases. This is a common practice in the Chinese e-commerce industry, but Amazon considers it an abuse of the review system.

“According to our analysis, the reason (for the suspension) might be because some items provided buyers gift cards, which is purportedly against Amazon platform rules,” SACA stated in the claim.

According to the statement, the three businesses affected by the new decision sell a variety of consumer electronics items, including baby monitoring cameras, with the affected products accounting for about one-third of Sunvalley’s total sales income on Amazon since the start of 2020.

Other Chinese businesses, including an online store sponsored by TikTok owner ByteDance, have been punished by the online platform for breaking its rules against false customer reviews.

Product listings from some of China’s largest electronic device retailers have gone from Amazon’s online marketplace since last month, according to SCMP. Amazon has a “zero-tolerance policy” for violations such as encouraging a friend to post a review, and its most recent move has sparked widespread public outrage in China due to the merchants involved.

Amazon’s electronics vendor Aukey is one of those affected, with Amazon accounting for more than three-thirds of its sales in the first quarters of 2018 and 2019, according to a prospectus filed in 2019.

The crackdown also hit Mpow, ByteDance’s major Amazon electronics store, and Patozon, a Xiaomi-backed consumer product company. According to a financial statement, it earned 2 billion yuan from exports in the first half of 2020.