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Gambling money is dirty because its all from people who only wants to have a instant money.Gamblers are greedy to win in every game. But there are lots in crypto who are rich people to multiply more their wealth because in crypto you can easily get big money depends on the value of the market.
In some religious group, we could say gambling is a dirty game and have also they think that money coming from gambling is also dirty.
It all be different from my sees, not actually it become dirty if you never indulge in illegalities happen in gambling. You have earned it hard and play it fairly.