If you ask whether it really exists, yes it does, the only thing you need to know is that whatever is on the dark web, whether it is illegal or not, is something that should not be underestimated. And does gambling exist? Yes indeed there are houses as we know most of such things are scam and fraud. So be careful and never just believe it. I've seen a gambling site on the dark web which I'm sure is a scam and why can I be sure because it's not easy to make a site like that work in real time. God bless U