I never read with him. But I do not believe that the readers could leave a review for themselves or any other. Unless they have made another account specifically to act as a client. But I do not believe that Keen would even be able to find them, cause they could be using one of their friend's/families names. but then again, it is just an assumption and a possibility.
I also wonder if anyone has brought up his rudeness to CS. But they will prob not do anything. Well regardless, I agree that new readers need to be careful of who they read with. Regardless of where they are reading from; Keen, CP, PS, Kasamba, etc.