I heard that in the country where I live now there are a lot of underground casinos. This is due to the fact that the casino pays huge amounts of money to the state for excess profits, and any casino would like to avoid these taxes. Many gamblers easily find these casinos through telegram groups, and that is why there are visitors there.
I myself know about these hidden casinos from the news, sometimes on TV and on the Internet they say that another casino was found, and it was hiding under the guise of a bar.