I prefer to asking closest friends who have experience playing on gambling websites because they will search the recommended gambling site, and they don't want to get scam. Sometimes, the reviews are fake because they want to invite many people to play in their site, so they do that fake reviews.
If he can update with the latest news about that site, that will help many people to know if the position is a change or not so people can select what they want. If, for some time, the site changes without any update on their website, then we need to suspicious because that will be two possibilities that happen to that site. One, there is something wrong happen, but they don't let their members know what is going on to their website. Second, they prepare to run away with the money.