Yes safedice is dead now. The owner and support (if there are) are inactive and there are many people just like you. However you might find this interesting: While trying to report the situation and getting it removed from a list, I checked their Safedice wallet page on walletexplorer.com and they are still doing some withdrawals-
https://www.walletexplorer.com/wallet/SafeDice.com . Wonder what is going on