Just chesk this source
and this is according to my version if both have risks it's just that these risks are different. for gambling the risk of losing all the money faster or at the same time losing at gambling but in crypto investment we don't immediately lose all the value of money, especially in bitcoin assets.
maybe a lot of people think about this problem and think if the two are almost similar but for me it's not. let's take a simple example when we get into gambling with a $10 budget betting on sports or other types of bets. but when the budget is used as an investment it will not disappear all at once because the price of bitcoin does not immediately fall to $10 when the price dump we can still sell it even though we lose $5.
furthermore, we cannot compare the number of population of bitcoin or crypto investors with gamblers around the world because surely the number of gamblers will be higher and will continue to increase after the slot game hype becomes the current trend and gambling has also been around for a long time before crypto was released.
so it's natural that the number of gamblers is greater than investor and not because the investment risk is much higher than gambling but it's just that people critical mind nowadays think about instant results and entertainment from gambling.