“Free lunch” was coined back in the mid-1800’s in the US when taverns started giving away free lunches with the purchase of a drink. The deal made people visit the tavern at lunchtime. The food was usually high in salt which meant that people would end up buying more drinks. So, the lunch was not “free”. It was paid for by the money spent on drinks. But the idea gained popularity quickly and soon taverns found they were running at a loss and the lunches were reduced to cheaper options like bread and cheese, until the numbers added up. There ain’t so such thing as a free lunch.
Free returns were introduced by online sellers with deep pockets, such as Amazon, in much the same vein. Competing with bricks-and-mortar stores, free online returns levelled the playing field for purely online retailers in the fashion market. But most companies that followed suit did so, not because the numbers added up, but because not doing so would lose them their consumer base. Even though they felt the pain of free returns, it felt like there was no other option. It is hard to make the returns process financially viable. Today, the massive increase in online returns has created a logistical and financial nightmare for retailers.