Philip,
I'm sorry to say you've posted what may only be deemed palpable nonsense.
After reading your post I checked to see if you are actually a Host. You are not.
Indeed, If you were a Host you couldn't possibly have written your post in this way.
Please check numerous discussions on this subject in the Community Centre, and you will find the full expression of Hosts concerns with negative reviews, not least the fear of listings either being paused or entirely delisted and with it loss of income. Hosts have to maintain a certain average to continue
Similarly, you will find an equal amount of discussion with Hosts deliberating their responsibity to post 'honest' review for Guests, especially if they are negative reviews in order to warn other hosts.. Moreover, at the end of the review and rating of Guests, Hosts are asked to state if they Recommend the guest or not (icon: thumb up or down).One result is that a Guest with negative reviews cannot book an Instant Book listing.
There is also the Response to Reviews option for both parties.
The proof of the pudding is in then taking the time and trouble to browse as many Host & Guest profiles as you can stomach. You will see the evidence for yourself.
It's a pity you didn't do this before flaunting your ignorance.