I don't know if they are a scam gambling site because like what I said before, I never use betking for playing the game.
Yes, the site is up as i just checked now. I am sure there is a confusion between the betking casino site and the betking token sale. On their official chat i found that they will plan to add the Servers at multiple places in a future update to avoid the site to be slowed down. Maybe some people are facing the slowness issue on the site.
Why there is a confusion between betking casino and betking token sale as both are managed by the same person? The token sale is the one that makes betking gets so many negative trust as many people are scammed by the token sale, logically there is another chance of another scam that may be done through the casino. Obviously it is really unfortunate to see the fact of their token sale while they should have done it in proper ways as they were one of the most trusted bitcoin casino in the past.