So many people on Amazon buys those junk in the first place. If US consumers did not have a demand for cheap products, those products wont be sold in the first place. So blame the consumers than the manufacturers.

How many articles have we had on HN describing the deceptive practices of people / companies building junk products trying to pass them off as a brand name? I find it difficult to blame people who have been deceived.

If that's what people demand then that's what they'll supply. If it wasn't a profitable venture, they would not be creating it.

It's a bit silly to assume that demand is the only driver. At some point, people can only buy what's supplied. If 99% of the stuff available is cheap junk and I don't have time to sort through that, likely I'll buying that cheap junk (or nothing at all).

One example is if a high quality item is no longer produced because the company or division selling it goes out of business as it's priced out of the market.

Supply-side domination/flooding can and does impact buying habits.

Oh, I'm sure its profitable, but nobody who has bought a fake charger on Amazon has demanded it. The amazing manufacturing and logistics capability is perfect for scammers.

Given that half the complaints I hear about Amazon are cheaply produced counterfeit goods sold at full price, I wouldn't be so quick to blame all of their failings on consumer demand.