For streamers, this is just a job, a way to earn money, and clicks or views are not always important to them (although they choose those with a large audience), sometimes it is important for them to simply create a video in which they win a big prize. In fact, I think that such a prize is very difficult to win, and it is almost impossible for an ordinary player to achieve this, but there are many who are able to believe that they can also win, after such a motivating video, this is what it is designed for.
Yes, the prize like that is difficult to win so we can only think that the streamer have a big luck. We also don't know if that is setting from the casino that let their streamer win big money to attract people to visit the site and playing gambling on there. If the audience can be wise of what they watch, they should not try to follow what the streamer do because that can make them lose too much money. While we don't have a big capital to playing gambling, we must limit our funds and not playing gambling too long.