Some people think that gambling is a scam due to their consistent losing in gambling, but their is a difference between losing in the gambling and a scam, casinos scam is been implies whereby you're not allowed to make a withdrawal when you win, or the site of the casino shutdown after series of winning from players.
People when they start in the world of casinos and specialize in a particular game, can get to master it so much that they become expert predictors, but what happens to them? When they make their bets and follow their patterns, everything changes and they lose and lose so often that they think that it is a scam, that the casino only took it out on them, that is what commonly happens and then they start to say that this casino is a fraud, that the game is a lie and many other things, but first, you should play in a recognized casino, and second you should learn to accept the house edge, when you accept that, by yourself you realize that gambling is not a scam.