I encountered this problem while trying to do Christmas shopping on Amazon. An example is this (parachute hammocks): https://smile.amazon.com/s/ref=nb_sb_noss_2?url=search-alias...

I don't know anything about them, I'm not familiar with manufacturers, but this search result brings up very similar items from "different" companies. What's even more suspicious is that there are MULTIPLE results that have 1-2 thousand reviews and are at a perfect 5*.