It wasn't a casino, it was a scam. They had 500k in bankroll, but allowed people to invest with 1 million. So, they were hoping to have so much turnover that a millionaire would get his fair share, even though the site wasn't up yet and they had completely no users. You don't ask for money if you don't even know how many people will play there. You start with buying ads, running a campaign, setting up free testing, referrals, and so on.
Nobody fell for it so he went on to work on another scam. Worry not, he'll be back. These people never stop they just change accounts.
I would say that it is a fake casino where op only wanted to scam people by making them believe that it is a casino where gamblers can gamble their money and also a feature where you can also invest. I already know that it's a scam from the moment op didn't take care of the ann thread and even the site itself. You are right that he/she/they will come back with different account to publish their so called casino which is not but a scam disguised as a casino.