It's still mostly junk. The issue is do you really want to spend time returning a $5 junk purchase? For most people the answer is no. This is just the stuff that was returned or didn't sell, imagine how much of the stuff is thrown away by the buyers.

Some things are just made to cheaply, to hit a price point people will pay. When people then buy the item and realise that it's garbage, it gets tossed. Just maybe you can't make a good air-fryer for $50, but people will see it and think "For $50 I can give it a go". They then conclude that it's rubbish and take it to the junk yard.

No, most of this stuff should never have been made in the first place. We need to stop making products that has to hit a price point, regardless of quality. We need to stop making one-time-use novelty items.

Then you have the secondary effect: Some clever business people sees this trend and starts ordering junk in bulk on Wish, AliExpress or Temu, dumps it in big boxes with a few good items (maybe) and starts their own "fake" Bin Store.