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The banning on gambling made by the government is totally ineffective and not only online gambling, even offline gambling still can operates on a country that has banned gambling. Gambling is something that cannot be eliminated among the public and young addicts will continue to grow because of high curiosity (not only about money) and those who do not have a good moral character will likely act negatively on their loss in gambling. High awareness and control are the main things to prevent gambling crime.
I agree - it's like the prohibition in the US in the early twentieth century, the forbidden fruit tastes better so banning gambling by the government will not eliminate it and maybe even encourage some people to try it ...
Returning to the main topic I think that gambling alone does not increase criminality, but it can be an indirect factor - people addicted to gambling who have lost everything will look for any way to get cash and get their money back and this can push them to crime ...
This is like saying that people who lost everything in trading go into crime...I doubt this is the case.
Gambling owners can make the gambling environment decent and crime free if they want to. Some are probably encouraging that kind of environment to attract more gamblers.