Comment by vineyardmike

There’s definitely a problem with my grandma or some less-technically educated person buying “alphabet soup” fakes, BUT Amazon does commingle inventory. This means that lots of people can end up with fakes sold by 3rd parties when buying from a reputable brand.

There were even stories of those crazy coupon people reselling on Amazon, and some cases of returned retail products ending up as “new” on Amazon. Which gets problematic with certain things like consumables (the WSJ did an article on toothpastes iirc).