If you take it that far, it doesn't really make sense. What if they have free shipping and free returns so I order and return tens of thousands of the same product just to make them pay shipping costs? They might technically not have that in the contract but clearly I'm abusing it.

A lot of ethics are built around acting in a was that benefits everyone, but that is hard to enforce without the person at the end having good intentions. At at certain point you're arguing that murder is only unethical if you get caught, which is rediculous.

But I think people claiming "ethics" by basically saying "don't use the policy" are just as absurd. What's the point of having a generous return policy if your ethics are basically "you can never return anything"?