A scam casino is not going to use only one tactic in order to scam their customers, once they have decided to go that route then they will use every single trick available to them to scam their customers, so if for example a gambler makes a bet higher than their average bet then they can manipulate the results so the gambler always losses that bet, they can use their TOS and interpret it freely to accuse their customers of cheating even if this never occurred, they can claim the user was hacked and that is why there are no funds on their account anymore, once you begin to think about you will realize there is no end to the number of excuses those casinos can use to steal our money.
Well, you are probably right that they can go to any extent if their basic motive of creating the casino is to scam people and steal their money, and the opportunities for them to successfully scam their customers without them knowing are thousands, and even if there are none, they can easily create one from their side.
Modification of Terms of Services is a very subtle yet effective way for gambling platforms to lie and scam their customers. If they publicly announce a change, that is okay, but if they hide it from even their customers, that gives it up that the casino has never been legit.