Amazon has a few systems in place for QC, things like 6% negative customer experience rate or certain keywords like counterfeit or related to safety that will get you flagged. Once you're flagged or shut down, it might take a week or two or more to sell again. You will probably have to pay for an expensive specialist to help you clear Amazon's red tape because if you mess up, and many people do, you might be banned forever from the Amazon marketplace. Almost like a sick video game.
It's a little funny but maddening how people will abuse every gear that makes the Amazon system tick. I use a number of Amazon softwares to scrape data from Amazon and I love seeing the bad players. I'm also in an expensive mastermind and their tactics are dirty. These are Americans so I can't even imagine the tactics that Chinese sellers might use. Honestly, every month I spend in this business makes me lose faith a little more. It's a dark system and I do not like where I think it's going.