Your donations make it possible. Forty-seven states profit from lotteries or other forms of gambling. The shadow economy is that area of commerce where voluntary transactions are prohibited, for example buying meat during wartime beyond your ration, or cigarettes without taxes, or alcohol during Prohibition. They will act to avoid detection, and there is no victim to notify the authorities. The police will therefore find it nearly impossible to enforce the prohibition, and will be tempted to resort to illegal means themselves, such as wire-tapping and searches without probably cause.
Ordinary citizens are no longer customers of the police, but adversaries.
If a transaction goes wrong, the aggrieved party cannot turn to the police for help. Proliferation of firearms in such a jungle is an obvious consequence. The temptation of easy money corrupts many people who would otherwise have found honest work. In this unregulated jungle, only increasingly vicious players survive. High profits and a lack of victims enable the participants to pay the police to look the other way, or to shut down only the weaker players.