Well there's 'Amazon', the market it provides. But there's also Amazon itself. Amazon itself doesn't really have competition. Therefore there's no insentive for

Well there's 'Amazon', the market it provides. But there's also Amazon itself. Amazon itself doesn't really have competition. Therefore there's no insentive for it to clean up it's listings, protect consumers from bad actors or generally help consumers in anyway. If Amazon had to actually compete to attract customers to its platform then it would improve the experience. Your own example proves the point. Flea markets might be cheap to run for the owner, but would people go there by choice if there were a superior alternative?