Nothing can fix this kind of problems and to be fair, these restrictions does more harm than good. People always do what you want, so none restriction can fully prevent it. What do you think, are most part of people seriously staying at home? People still workout secretly, still offer some services secretly, people still do things that they were doing before secretly. But if we return to the subject of this topic, it's hard for me to believe that people go in underground casinos because nowadays online gambling is highly developed and popular too, there is done everything for customers comfort.
I strongly agree with this.
Illegal gambling sites or even physical ones are hard to be exterminated in the world of legal gambling. Even if you successfully shutdown one illegal gambling site, you should expect that it'll be revive in their backed up domain, so on and so forth. And for the physical ones, locating them would be hard since most of them are always in the underground, and being handle by drug lords, gangs, that has a strong ties inside the police authority or Government, that's why they are untouchable.
The only reason why the Government are trying to shut them down because they are the tax evasive citizens, that earns a lot of money in an illegal way while the Government don't get anything from them but headaches.