The problem stems from their not-so-brilliant recent move to start allowing reviews even if the guest cancels and never even stepped in the property at all, to accomodate the rarer events that the reason the guest cancelled had 'something' to do with the actions of the host, before arrival. Imagine how this can be abused by hosts trying to sabotage one another as competition amongs them rises in a given area.
They didn't think this potential absurdity through probably because of their present inherent bias towards placating to the constant clamor from their guests for more 'rights'.
They do realize they need to start 'seeing' things from outside of their now possibly 'inbred corporate culture' and have an existing program to get the opinions from selected hosts/guests throughout the world outside of it, on every subject of their model. A most positive move.