Why huge risk? if don't have access to bitcoind, can't to stole money.
I have access to VPS with bitcoin node only.. no one have access to this vps.
What your advice? Need removed this blockchaid node and install new bitcoind?
I can't believe someone running a gambling site that handles other's bitcoins doesn't understand how bitcoin works. It's very easy for the person that generated the addresses (assuming what you say is true, I still doubt it) to keep the private keys and spend your Bitcoin later. You need to generate new addresses, and make sure he doesn't have access to your VPS.