in Japan I experience none of the problems that people in HN seem to have with Amazon in other countries. Never encountered fake products, return has always worked, and stuff that never arrived was also reimbursed. Maybe I'm an exception.
Louis Rossmann have a video about fake electrical fuses sold on Amazon US with almost half a million views. Literally the product that can burn your house to the ground:
https://www.youtube.com/watch?v=B90_SNNbcoU
Did Amazon US at least pulled these off store? Nope.
Maybe. Or it could be simply relying on being a high-trust society. Screw up with consumers, and people will talk about it and shame you night and day.