It's not all about money. The problem is so many countries concerning about regulation in gambling caused by they were getting triggered by money laundering. So many accusations that came to the gambling sites were about money laundering and it's not related with the taxation. I think that's why government was always trying to ban anything related with it. Im not even doubt if some sites were trying to avoid it
Gambling casino seems easy how to use for money laundering and problem for several countries around the world still not have regulation for legal with casino gambling. Last month my country government made money laundering almost 50 million dollar to one casino gambling at Singapore, seems huge deposit amount in casino gambling not more selective about money source. Need change about regulation and more selective when deposit huge amount at gambling casino before get regulation from several countries around the world.