For old people they believe that its a dirty money so every one will stay out of gambling, but for modern people they don't think it as dirty money,some people play using calculations and strategy, so they do hard work of research to make profit, so I don't consider gambling money as dirty money, dirty money is money that come from doing criminal things and I don't see gambling as a criminal activity
The problem with many people having the thought that gambling is related to crime is because of religion and is the bad influence of a small group of people called government. it is ironic because many churches drain money from poor people and many government people are corrupt people and it is those same people who say gambling is related to crime