In France, for example, it's legal for the customer to be on the hook for return shipping. This is often the case with smaller merchants, but even bigger ones have this policy. Example: Darty [0]

So if you have to pay for the crap to be shipped all the way back to China, I can see how that may become expensive.

[0] Darty return policy, in French: https://www.darty.com/achat/services/retour-retractation/ind...