Retailers have realized that people are more likely to buy something if they can return it later if they are not satisfied. When it comes on online purchases, they are even more likely to do so if the company offers to pay for the return mailing costs. This has resulted in some people taken advantage of this to essentially get free short-term loans of products that they use for a specific occasion or period and then return.
I had thought that retailers simply put the retuned items on the shelves to be resold. But according to Samantha Bee, much of this stuff is just thrown away and ends up in landfills, a tremendous waste.