This is simply untrue. Any cryptocurrency with a public ledger of transactions and balances cannot be considered private.
Although this is debatable, it is not relevant to the topic at hand.
It's entirely relevant to our website and the design decisions we have made. All Bitcoin transactions are public, all Bitcoin address balances are public. The opposite is true with Monero. We can't know if the player has a million XMR or 0.1 XMR. We can't know where they've spent their coin, the amounts they paid, or when their transactions were made. When a user withdraws their winnings there's no blockchain website displaying "Dice.ag Hot Wallet" showing they've made a withdrawal and how much. Monero is private by default, and that's why it's at the heart of our business.