Comment by didibus

Sorry, I meant for the customer. I agree that Amazon could both better validate and indicate to the customers which vendor are the official manufacturer, as well as allow you to opt out of comingling and actually say you want the item to have been from that vendor (even if at an extra cost)

But if there were no marketplace such as Etsy, Amazon or Ebay, I think it would be harder for the customer to trust a random website. At least with these marketplaces, you can trust the payment channels, the security of the data you give them, that the support contact will be responsive, that the item will be delivered properly and at all, etc.