I think money laundering if done is done through mixers more than is done in casinos although people may use casinos for small amounts which really is not considered money laundering.The casinos may serve a good purpose in making your coins anonymous as you can deposit to them through a wallet and receive money in a brand new wallet that you create and the tx id is different because the money is coming from a wallet of that casino,that is the maximum people can use casinos but criminals to launder money through them I find it hard to believe.
I think that the real money laundering is to ensure that the right person gets their hands on a completely legal fiat. "Winning" from the casino is still gray money, since you have to declare it and pay taxes (different conditions in different countries), so it seems to me that those who launder amounts of money at least a little more than small ones use other schemes.
Well, I think we know something, that those who launder money the most like governments for nothing in the world do it through a casino, because it is simply very risky, they have other methods, but yes, it may be that some who are very new resort to casinos, but I don't see it as easy, casinos now have many regulatory agents, and those regulatory agents achieve them thanks to the authentication of their licenses, those same licenses that in many threads of new casinos we as players demand for our " security" thing that for me is not a guarantee, I think that if money is laundered, the least they use now is casinos.