What if the creator somehow profits from the system? One could imagine a Bitcoin-esque system where the creator includes rules in the client that require every

What if the creator somehow profits from the system? One could imagine a Bitcoin-esque system where the creator includes rules in the client that require every transaction to send a small cut to a Bitcoin address he owns. [1] If that system then "happens" to be used for illegal purposes like drug trafficking, is the developer of the system committing a crime? It's distributed so he can't shut it down and he's no longer actively participating. What if he destroys the private key of the Bitcoin address? It's an interesting thought experiment... [1] Of course you'd need a critical mass of users and the right incentives to prevent people from starting their own "alt-markets" much like Bitcoin has spawned dozens of "alt-coins".