Can't see it because in my country gambling is prohibited. But from what i heard is there are some casinos that really cheat to gambler, that is why they still exist until now. Not only in online casinos, offline casinos do something like that too.
That is why many casinos can make a lot of money from this business, but I am sure that not all casino do that. I think in the online casinos, they tried to cheat like offline casino because it's related to huge money which is inside the gambling. But if the casino still does this for a long time, soon or later, some people will realize and will spread about the bad news to the public, and it will make the gamblers moves to the other casino because they feel been cheated by the casino. They don't want to get a bad experience in the casino so they will search the other casino to play.
That's the effect where mostly high reputed casino houses are avoiding to happen, they love embracing things where gamblers will be please to stay,
in the short term business cheating can bring them decent earnings but for long term process it will turned the business to its worst ending, well
known casinos don't want that as they are looking/aiming for long term success.
Taking advantage though is not cheating, from both side as long as you are not doing anything to change the results, you are just using
the skills of observing things that can possibly to happen.