side note:

Amazon is a marketplace, and more and more different vendors came to that place selling cheaper, shady things. They seems to have an open door policy. It's somewhat understandable.

But that same strategy got adopted in many different places.

Decathlon on their website offer products from other vendors. It's really shady as they advertise hassle free returns everywhere but that only applies to products sold by them specifically, not to majority of products available in their shop.

Kaufland (if you're in US think Germany's Walmart) has the same thing going on.