I see people commenting that it exists where gambling is prohibited but it exists almost everywhere only because the gamblers don't want to pay taxes and there's high rollers involved here too if they want to launder their money made from other sources or simply it offers more exclusive games that we can never witness in common life. Might be I am influenced after watching Squid games but it's real, in some middle eastern cities where these things are prohibited but made available due to the demand.