Most of the time, you leave a negative response, that post gets mysteriously nixed.......
Yes! My last 2 negative Amazon reviews were not published.
The Chinese sellers have connections inside Amazon. They can delete reviews. They can sabotage competitors.
To my experience, THAT is mostly on eBay, which is why I left after 17 years. I found out that eBay was removing negative feedback to make certain "supersellers" more attractive to buy from. Since eBay receives their cut from each sale, you can easily see why an unscrupulous company like eBay would not want to discourage people from buying stuff, even from lowlife sellers.