Money laundering is never done by one person. They have a group for money laundering and in that group many types of people are involved like government party influential people, big businessmen, many bankers, police etc. And they find different ways. Even if it involves crypto. Not so much associated with casinos
Here I agree with you. Nowadays money laundering is rapidly increasing by those who are high ranking government officials or big businessmen. Illegal money transfers happen to such people. It is more simply said that this tendency is higher among those who are making money illegally. Those involved in money laundering is usually pre-planned.
Money laundering will always be there, in every business not only in crypto.
So ML may be happening right now in casinos and other gambling websites.
But it depends on the casinos how they will tackle such fraudulent action as they have policies towards AML/KYC.
We can't totally avoid this to happen as launderers will always find a way how to wash their money.