They are so unrealistic because most streamers vicariously make money and the wider audience their videos attract the more profit they get. Sure, the size of the given video crowd depends on the stage direction, so some of them I know one guy that do this more than often even invite gambling directors whose duties include the cutting off so called non-clickable scenes.
Indeed, with the increasing number of followers and viewers, the greater their profits, some of the other profits are from viewers who register using the link that is usually provided by the streamer, even though few people register, at least the streamer benefits from the many viewers who follow him.
Many people suddenly become gambling streamers, only I myself am not sure even if I do it I will succeed because I myself am the type of person who is not confident in front of the camera. But even if they cheat we can't do anything, maybe just leave a bad review. There are also some streamers who work with their casinos, I'm sure of this.