This is a result of their lax quality (flooded with ad hoc businesses selling garbage, counterfeits, inaccurate listings, etc). When you go that route and you'r

This is a result of their lax quality (flooded with ad hoc businesses selling garbage, counterfeits, inaccurate listings, etc). When you go that route and you're the size of Amazon, it actually makes more sense to completely side-step having to deal with the flood of customers unhappy with all these problems. Just give them their money back. Don't even bother trying to get the product back if it's missing. As a bonus, you get an image boost. It's more efficient than having a process to case-by-case deal with the results of their completely abandoning quality/trust at the point of sale.