Just play by the rules and our terms and conditions and you are fine like 99.9% of our customers.
How is a withdrawal of deposited funds an "abuse"?
Just charge a good fee on the withdrawal, and that's it.
I don't understand why people would use a gambling site as a mixer when ChipMixer has such a straightforward service.
Well they use it as a mixer since some gambling site don't really charge a lot compared to mixing services. Also, they can deposit an infinite amount of times into the site and output it to one address with the sending address being different from the address they deposited with. This is quite similar to exchanges. Problem is, these casinos and exchanges keep logs of such things and in the event they are required by the government to present those data, then you are exposed. Unlike what mixers promises. Not to mention usually this act is prohibited by the ToS of most gambling sites.