When a product suddenly sells a lot (a fidget spinner for example) Amazon starts selling it too. If you cannot buy a better ad placement than Amazon's competing

When a product suddenly sells a lot (a fidget spinner for example) Amazon starts selling it too. If you cannot buy a better ad placement than Amazon's competing product you will sell less. The sellers that wasn't selling a lot of products already will be dead. If that isn't driving out the competition I don't know what it is. >unfairly privileging its own brands will lead to > drive others out of business