Here I agree with you. They either got a retun reason like “never used, changed my mind” or simply figured out that for a vast majority of purchases with return codes like this, it is safe to reshelf the object and ship it as new.
Whether the object is to be considered “new” or “like new / used” is probably a gray area. I’m not aware of where most other retailers draw the line on this one (walmart, target, costco, etc.). I’m sure the problem is even harder for online retailers, mostly because its much easier for people to lie on an online return form.
Regardless, my only gripe was people in this thread assuming a conspiracy where they intentionally rotate and peddle defective items hoping someone eats the cost.