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Any government has never collected any taxes to the user through crypto casinos and I dont think its possible either because online casino customers come from all over the world.
Not directly. But from an huge amount like this, it's really hard to hide this amount.
Unless the user is going to live in a standard way and maybe spend some cash abroad.
I would have a look with some LOCAL tax advisor. Probably (but depends from country) best option is just made a cash out and paying this tax.
Fraud with tax in some country can lead to prison etc etc.... I will strictly follow the local law ....