Do you know many people who'd be willing to risk their life to give the Sinaloa cartel a bad yelp review?
Sinaola cartel sells lsd, dmt and mushrooms in personal quantities?
As far as I remember, those weren't the only drugs sold there, nor was there any rule enforced regarding "personal quantities".
Not that it matters, as it was an illustrative example.
even if its not perfect for every situation it was a lot better then what existed.
negative reviews aren't the only review, absence of positive reviews is a signal, along with a lot of other positive reviews. later markets at least had reviews outside the markets too
if you are in the bulk and resale drug market you probably aren't getting package with your name on it to your home.