This might be a plus for the customer in the short term, but how is it a plus in the long term, when the innovation which creates the new products is snuffed?
Do you think Amazon is going to innovate on niche products? Why would they steal other peoples designs if that were the case. They put the original company in financial straits or out of business and then don’t do any meaningful iteration on the products
Amazon isn't stealing IP and building their own factories. They are cutting out middle men and going straight to the producers themselves. Cutting out the middle man gives the inventors greater income and the consumers lower prices.