> If you're going to run a casino (whose entire business model is based on exploiting weaknesses of others for profit),
There are plenty of casios, and many of them comply with the law. People who choose to gamble there might be exploited by some definition, but it is consentual. But Primedice is a casino that uses bitcoin to allow users to circumvent local gambling laws, and thus exploits weakness in criminal laws.
(I will not discuss the morality of current anti-gambling laws in the US, as any rational person can see the hypocrisy in the current system of state-sponsored lotteries and state-granted casino monopolies)
> don't be surprised if people try to exploit your weaknesses for profit.
Primedice reusing a nonce/seed is like a casino dealing blackjack from a marked deck. It is so incredibly stupid that you are guaranteed to have someone notice, and clean you out while still playing by yor rules.
Note that they are offering a reward for the "return of the [bit]coins". I assume that means they are offering that if someone hacks a bitcoin wallet and gives them the proceeds, they will share a fraction of the stolen assets. I would happily make the same offer; paying random people who give me bitcoins from hacked wallets some of the stolen bitcoin, except that I'm not an exploitive, criminal-minded narcissist rationalizing theft to support the operation of a gambling site based on a cyber-currency designed to facilitate extra-legal activity.