Obviously most of the answer is bias
We can give so many recommended gambling site to him or to anybody who wants to try playing gambling. But they need to think about the risk of playing gambling prepare themselves to accept the loss because when they decide to gamble, they have a big chance to loss. Some people don't understand this, and they become sad and angry if they lose and decide to continue to gamble because they want to get their money back. So if you choose one or two gambling site, make sure you can accept the loss.