There are all kinds of review sites out there (not mentioning Amazon and TripAdvisor, but let's take Trustpilot) where people leave all kinds of reviews, some of them are even stellar. So, I your logic doesn't fully add up to me, sorry, maybe it's just me. Sure, LocalBitcoins.com is the market leader, but I've read Paxful aimed to add improvements, remove frictions.

Is this topic about trading or exchanges, by the way?