Gambling is all about random number generation, and provably fair scheme provides guarantees that casino doesn't cheat, but we also know that humans are horrible random number generators - we are very easily predictable.
not all gambling are based on generating random numbers . what card games like poker ? that is an example of skill based and you are using a card not numbers . there is not right or wrong in generating a number because that is random but i think we it comes to solving something , ai or bots can work well versus humans .
So, theoretically a casino can observe how you place your bets, then predict your next bets and make their own bets (they always go first) accordingly.
they can observe your bets but they cant predict your next bets not unless if they are not fair . also not all gambling game is in versus mode ( dice game for example ) i think this games are more safe .