What makes me curious is, what the reason from the hacker to hack unpopular site like sicodice?
Money? I do not think sicodice has good amount of money (bankroll on the hot wallet) so I think it does not worth for the hacker to hack sicodice.
High likely, it is just a trick from the owner to run away with people's money and made a lie that the site has been hacked.
I have no account in this site, do they have official social media accounts?
So, IMO is just an inside jobs exit scam but let's pretended the hack is real

unpopular website have less security system comparing some major casino even with a small website the balance (bankroll) still has some decent money could be a thousand dollar.
Comparing with the easy breach of the website + the balance reach more than thousand dollar, I guess is still nice money because could be they not doing such a hard things to breach the website.