I would never trust an online casino. All the real casinos in the USA have state gaming police that verify that all the slot machines and video poker machine are really paying out at the odds that they were reportedly set to. The gaming police also investigate cases of cheating at table games. I worked in a casino many years ago and I have seen all the regulation and government oversight that goes into the casino industry. I can only imagine how crooked a casino would be with no regulation.
Well this is exactly why these bigger type bitcoin casinos are acting out of non-US based locations such as south america and this curacao place. In which I have never heard of until this conglomerate of the ones with the .IO based domain started to appear a few years ago.