Most people are capable of gambling responsibly for fun. They enjoy it when they win and can deal with it when they lose. A small number of people are problem gamblers, they bet too much and cannot deal with it emotionally when they lose. Often these people also cannot take responsibility for their own actions and have to find someone else to blame. Making unfounded slanderous scam accusations against the gambling site is often a get out used to avoid dealing with the real problem they have.

I strongly recommend you stay away from gambling and don't project your deficiencies on everyone else.