It depends on to whom we ask this question because if we ask this question to gamblers they will always say it is correct and also will justify with their own ways and if you ask same questions to non gamblers then they will say no and they also will have their own justifications. So as per me as long as on use it in a proper way then it is not wrong but fully addicted to it and not bothering about other things then it is wrong.
Yeah, Gambling is not wrong if it is in limits, but if it becomes an addiction then one day you are gonna loose all your hard earned money and even bitcoins as gambling doesn't guarantees us success everytime, it is just a matter of luck, if you are lucky enough on that particular day, you can even hit the jackpot or else end up loosing.