Wow, I have never encountered such and I am just getting to know about this for the first time, such an option is absolutely bullshit if you ask me, and using money laundering and mixing to excuse such option is another bullshit, peeps should be free do whatever they want with their money, why force me to gamble if I changed my mind after depositing into your casino? Makes no sense to me....
If I know such casino, I will never use it, it's as simple as that.
No casino wants to be accused of money laundering, and making a deposit and then withdrawing it is very similar to washing funds.
Before playing at the casino, you need to carefully read the terms of use of the casino and then there will be no problems, including there will be no problems with money laundering.