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The thing is that we humans are not great dealing with probabilities in our minds, so the casinos and other gambling companies simply use this fact in their favor.
It's not natural to think about probabilities, we are just not good at it. On the other hand for example we are great at thinking in terms of Newtonian physics, we don't need to calculate an equation to know how to throw a rock for example, yet we can think perfectly well how to do it. For probabilities you actually have to calculate the math behind it.
True, but that being said, every (or almost every) casino goer or other gambler is at least aware that odds are not in their favour and that's not the reason they engage in gambling.
The major appeal of casinos, be it physical or online ones, is probably the entertainment and the dopamine rush, while nation-wide lotteries with huge winnings sell people hope and possibility (statistically impossible but still) of changing their lives in an instant without any effort.