So your idea, Uneng, on trying to change the ideas or the minds of these victims would be difficult, but achievable through patience and determination. It's all a long-term goal. Look around the internet, there've been recently some complaints flying around about the streamers not being trustworthy and using their affiliation with the casino to deceive viewers.
A lot of patience, determination and endurance can bring some results on long run, but it won't happen at all until people see others falling and losing money when following those influencers' steps, or losing money themselves. Some will learn by the example of others, while some will have to learn by their own mistakes. We can give assistance, guidance, advices and even suffer some consequences like being insulted back or receiving rage from people who are blind by their flesh idols, but you are right on the sense it's a long term goal that might worth the sacrifice and struggle on the present moment from our side.
The reputation of influencers, coaches and celebrities in general are decreasing these days, as constant scandals comes up, besides their followers being prejudiced in the process. Some lose money, others lose touch with friends and relatives, while in worst cases, people even lose their lives! All motivated by idolatry, which takes people to adopt unreasonable attitudes and decisions, prejudicing themselves in the end of the process.
In gambling it works like: "if influencer X said it's good, then it's true, therefore I should do this exactly like him", while disregarding rational and logical evaluations about the content watched, like: "why is he suddenly sharing a gambling live"?; "what are the risks this game involve?"; "why does he want me to gamble?"... These critical questions raise our awareness about potential dangers we face ahead and are necessary for our survival. Once we avoid them, we are prone to being extinguished, like sheep walking into the slaughterhouse.