At some point, we can conclude scamming customers is a big business model of many Casino or Gambling sites.
Because how many customers will complain publicly?
Not many and even less will finally get a refund.
Some customers will just write a negative review, walk away and Casino or Gambling site will keep all profits.
That might be true of some users who don't know where to complain, but if a panel of users were to be created and someone did some good SEO work, it could end up being a top search result for where to file complaints against casinos. Now whether or not casinos will agree to use said panel as a mediator is another problem.