Joined their site, with their "free" promotion. "Won" .04 BTC on my third spin. Tried to cash it out. You must deposit .015 BTC to get "verified".
I messaged their support and they said that I would have to make a deposit to withdraw

So I said to them, "this sounds like an email fraud scam to get your lottery winnings released". It did not get answered for a while, then I clicked to go watch the "lottery" and got "You are banned!"
https://imgur.com/a/sgltag3 you can see my "winnings"
Total fraud site. Their support email bounces back as no address. Whois shows recent registration.
Domain Name: cryptoroulette.world
Registry Domain ID: 6fb956788de14796a2c1815ccf5c8264-DONUTS
Registrar WHOIS Server: whois.namecheap.com
Registrar URL:
https://www.namecheap.com/Updated Date: 2019-07-23T08:33:42Z
Creation Date: 2019-07-23T07:37:02Z
Registry Expiry Date: 2020-07-23T07:37:02Z
Chat box is total non relevant to their ongoing lottery, just random messages that aren't conversing with any others in the room.