If the difference between Amazon-sold product’s and third-party-sold products isn’t clear (and it isn’t) then Amazon should be held responsible. It’s like if those AT&T sales people at Costco sold you a phone that caught your face on fire, then Costco is reasonably responsible because they are lending their credibility to a negligent third party. Possible mitigated if they made a good faith effort to distance themselves from third party sellers.

So there is some nuance to it (IMO).