most of us does not have the discipline to just gambling based on our limit, if we have a bankroll in a site, we would just gamble it all and just withdraw if we win, and if we lose there's no tomorrow.
That is why people should only deposit the amount they know they might lose and can afford to lose. At times people use gambling sites as wallets which is highly dangerous because when you are on a losing streak you might gamble everything away in frustration without even realizing that the money was not meant to be gambled away.
Not new, for ages, gambling still doesn't learn and that's the reason why casinos revenue keeps growing because when people learn to gamble, they are usually greedy at the beginning.
That is true and the richest guys in the crypto market are usually the ones who own a casino or even sportsbook because the profits are insanely high and there are often illegal casinos running which are fair for players but they earn a lot and avoid any taxation and legal laws just because they are operating in crypto.