wait that site scammed? was just a matter of time, it did not look too inviting for me from the beginning on.
How many coins have been stolen? The owner just disappeared?

The ninjas took about 2000 coins and disappeared. Like ninjas. I'm going to be samurai. We hunt down ninjas.
The way JD, DD, DN, DB, ED and every other site that takes investments and allocates a share of profits based on that investment is structured is as a security. You can call the "unit" whatever you want: shares, interests, percentage... that doesn't matter. The SEC calls it a security.
"Participation in any profit-sharing agreement." You can call it whatever you want, but it's definitely this. That means it's definitely an unregistered security.
How about if we call it, like Baccarat Punto Banco, and it's actually a bet? You bet against other players. That's essentially what you're doing when you contribute to the bankroll of these dice sites.
Again, it doesn't matter what you call it. The SEC's definition is in black and white. It only matters what they call it. There have been a lot richer and smarter people (with A LOT more money at stake) trying to massage the definition of "security" since it was written in 1933. Alas, a security is a security.