I think you should take it a little easier. It's not like you would pay 50$ for a ticket to play and it's not like there would be an enormous jackpot of 500.000$ like other gambling websites promise. I am not trying to promote anything here since I am not related with that website, all I want to say is that they have the right to keep their money balance private just like any other casino/sportsbook. The jackpot is running on their website and not on this forum so if they don't want to show it that's it. It's your choice if you play or not.
I don't think that's a valid argument - any gambling organization claiming to have made payments in tens of thousands of dollars should have verifiable proof of paying out that kind of money.
It's not rocket science, either you have proof or you are lying about that kind of money. Simple.