Winning in gambling is hard without a doubt, but we cannot deny that fact that it is illegal, there are laws that's made by the Government, and just to inform you, those online casinos doesn't have any legal permit which is a requirement to legalize it as a business, like an actual casinos, but even though they have permits, the majority's mindset about the money we earn in gambling is dirty, therefore it is dirty.
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Regardless of whether an online casino is licensed or not, it still remains a gamble. Similarly, the statement that gambling is dirty money is not true. If gambling is prohibited in your country, then you should not break the laws.