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.
Maybe I am just a lucky guy, but 99% of video streams or compilations with large wins I have see were made on Stake.com casino or on popular slots. I have never seen stream where someone is gambling not on a popular platform. I dont know how to make fake video playing on stake or lets say Gates of Olympus. I dont know how can someone download casino webpage or slot game, edit it and fake that he is playing on a real one. I still think that all we see is compilation of win or cut from long streams, which is only 1% of all gameplay they do. We see only hip of the iceberg.