ok, i think bitcoin is not illegal even if you are operating a gamble website.
lets look at zynga poker. they are selling coins for money too but you are not allowed to change it to a currency.
It's not just they don't allow it, but they take technical measures to prevent it and don't intend it.
gambling sites in bitcoin is also like this!
They take technical measures to keep you from selling your bitcoins and don't intend you to make profits in national currencies? Try again.
so if bitcoin gambling is illegal then we can conclude that zynga poker is illegal and all other credit based game out there
Nope, sorry.