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Gambling is easy money - gamblor get temporary profits sometime but they cannot depend on gambling to run their monthly income.
Its a matter of luck and that is it. If the day is unlucky you can loose all the money in a jiffy.
Especially when you lose, you will lose more if you are ambitious to win in the next game. Gambling ambition is the biggest supporter of losing. No matter how much you win, you end up losing. So never trust gambling money.
Those who have reached the stage of gambling addiction will definitely make gambling (winning) their ambition. it is very rare for people (who are not gambling addicts) to make gambling their ambition, let alone to make gambling their passive income. luckily there is currently a good concept on crypto gambling sites, it is staking (usually issued by gambling sites that have their own coins), and the owner of the gambling coin gets passive income from staking the coin.