If you are a tour operator and are considering to join Viator, don't. The have extremly high comissions to guarantee your visibilty and their costumer service is awful. Here you depend also on reviews, but basically you can not do anything in case you receive a false or unfair review, because they don't care. Is better if you use GetYourGuide, which is more tour operator friendly. But Viator is terrible. Maybe one of the worst OTA.
