Annoying isn’t it? As hosts you feel like they hold you by the balls - as bad reviews affect you. I had one guest who mysteriously found roaches / took pictures. I never realized until my infuriated maid pointed out was the same two roaches a large brown and a small dark one in all pictures- all over the house.
Cost me calling put my pest control etc. After all that and a maid cleaning while she was in the house, the woman writes a 5 page review on my wall stating that I never have her a discount.