There is also the fact that hosts can take down negative reviews for a variety of dubious reasons. The fault here is entirely with Airbnb. The reviews are the only real information that you can use before booking (and yes you can discuss over messages but the UX flow doesn't really accommodate this in a meaningful way where both parties agreeing to terms before the booking is made). I recall Lyft used to send people out to inspect cars and give training before letting someone drive. Airbnb is just being cheap and lazy on this front.