> After the initial phase of early adopters that offer generally high quality products, a flood of fake or low-quality listing tries to squeeze money out of the platform.

See "We become what we behold" https://news.ycombinator.com/item?id=33273640 and https://ncase.me/trust/ from the first comment. A high trust society, or marketplace, is an opportunity for the defectors to extract value. Unless they can be punished somehow ...