So that's the logic, meaning it doesn't make sense if there really is a person or group of people who can really predict the outcome of gambling 100% accurately, that's very unlikely, unless they have a very close relationship with the casino then maybe that's possible. could be a little possible.
And as you said, if this could really happen, then yes, of course there would be many gamblers who would become billionaires, but what we see is not like that, on the contrary, the majority of gamblers actually experience a lot of loss of money, even with large amounts of money. which is very large, and in fact we can see that recently more and more new casinos have appeared, especially in online media, when what happens is that more new casinos appear, it means that gambling is a really profitable business for casinos.
Whatever you do in this life, whether it's gambling or all sort of trading by professionals I don't buy into them because I have understand human have one thing in common, they hardly share recipe of ways they make money or let people know how to make the money, they will continue to milk that place and the source to that money will remain unknown until it become popular before the public may get the idea and by that time, it will be saturated and wouldn't have money again.
This is why I don't ever belive all this professionalism of gambling, if they are that good, they will be the only one playing the games and doing their own predictions without letting people knows. Why would you offer help with average money when you can just increase your capital and continue to gamble until you build a bank from there, that's when everyone will believe how genius you are as a gambler but they don't do this because they are failure and lies.