Well depends on country that you are staying, If you are in the US then definitely you can to pay the government crypto taxes. But if you are not, then you have to contact your local IRS to see who taxes are being applied to crypto.
True. He may have to move to Puerto Rico or the UAE to avoid paying the government crypto taxes.
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.
Yes, it is not possible. Taxes can only be collected via KYC required centralized exchanges like Coinbase.