This looks like one of the EOS clones. Some of them were scams. Not saying this is. But beware. Think ahead..how will this make you money? In the beginning people mine a lot so they can stake and earn dividends. What happens when mining is no longer profitable and there are no true gamblers on the platform? It dies. Like has happened to all the gambling dapps on EOS and TRON. I have a feeling that some of these projects (not saying this one does that) are taking advantage of Steemians not being aware of what has happened on EOS. We've been through this on EOS the past 5 months. The rise and fall of gambling dapps. There is no adoption to crypto, so...that's what happens.
Also, saying they have millions of users? Where?
RE: Introducing SteemBet - the Next-generation Steem-based Gaming Platform