I’m not clear on how this solves the problem. Counterfeits can be hard to detect. Counterfeit food, toiletries, and electronics can poison you or start a fire. And my redress is a generous return policy?
Inventory commingling ruined any respect I had for them. They've done that for a long time but I still am beyond pissed by the trend they started of being a front for third party sellers, all French retailers copied them (darty, fnac, cdiscount etc) and searching for products sold by trustworthy entities on the internet is now a nightmare.
Everyone imitates the market leader so it really feels as if competition doesn't exist as an alternative to amazon here. They're all as bad, and sometimes worse.