I want to discuss something more detailed here, if the fraud in question is that they promise their users to win, I don't think that ever happened. Because I saw them using the word "chance" to win, not "certain" to win. And what is called opportunity is something that is uncertain, it could be wrong and it could be right, so the conclusion is that they are not cheating, they are just promoting by playing with words to attract many users. It would be a different story if a site was indeed cheating, so it's not gambling that is a scam, but the site they use cheats by not paying the winnings of users and so on.
How can they promise their users a win, it's impossible, they can only promise the best service, a wide variety of games, a large line, fast withdrawals and everything related to the game, but winning is only the player's business. And the scam may consist in the fact that, for example, it is impossible to win in some game, or after winning the casino does not allow the player to withdraw his winnings, that would be fraud.