I'm not quite sure which are you referring to:
https://leomonacocasino.com/ or
https://leonmonaco.com/since the other was not really trusted poor terms and condition and and without other features and the other one I think is the one you are referring to it seems that it's like a normal fiat casino but the thing is that I think they will be needing KYC once you registered which is not good for a unlicensed fiat casino.
Account must be activated through the Welcome email and KYC verified by uploading the following documents:
Coloured Photocopy/Picture of your ID card, Passport or Driver's License. We need to see your full name, D.O.B and Expiry Date;
Real-time photo ( "selfie" ) while holding the front and back sides of the document you chose, under your chin;
Coloured Photocopy/Picture/Screenshot of a recent Utility bill / Bank statement (no older than 3 months) showing the issue date, your name, address and the company logo;
Both domain names were probably under the same management, especially if they have a similar design for the site, but I don't click those websites you mention for the safety.
I won't suggest other people click unknown links. Besides that, the other members don't know about that site.
But by the way, we already have so many reputable gambling websites that you can use to play gambling.
Using KYC verification to playing gambling will not a good idea for me because I want just to play gambling, and spend my free time.
The verification list is like what I see in the exchanges. I will skip this site and don't want to try to playing gambling on that site.