A good fake is borderline undetectable. So your friends could have received fakes and not known.
It's not like many people would buy several copies of a book or DVD to do a side-by-side comparison of textures and precise colour matching. Or have the equipment to tell apart a CRI 95 LED bulb from a CRI 80 bulb in the same housing. Or tell name-brand nail polish from generic in an identical bottle, or a genuine Apple charger from a good clone.
Of course, my experience with Amazon in the UK is it's nowhere near as bad as AliExpress.
It's not like many people would buy several copies of a book or DVD to do a side-by-side comparison of textures and precise colour matching. Or have the equipment to tell apart a CRI 95 LED bulb from a CRI 80 bulb in the same housing. Or tell name-brand nail polish from generic in an identical bottle, or a genuine Apple charger from a good clone.
Of course, my experience with Amazon in the UK is it's nowhere near as bad as AliExpress.