~ VPN is not bad as long as it isn't specially said to be a banned offense. And I have to say, using another IP other than yours, hell using an IP that is not even from the same place as yours, would always end up blowing back on your face for sure. Doesn't mean that it will be caught right away, or even if not caught, doesn't mean it will not create a problem.
But why? Can't you be travelling, for example? These days many people travel a lot, and they have their laptop with them. If today they log in to Duelbits from Madrid, and the next day it's Berlin, they can be traveling or they can be using VPN, how can you tell?
That may be true, but there are ways to find if that's true or not. First of all, they could ask for you to show your passport and that means if you were in Madrid and Berlin, then they will let you go but if you can't then how did you manage to be in those places without having a passport that shows it? Simple right? That's how they can make sure that nobody plays with the VPN because that will never be resulting with something that will benefit you. In the end, it will hurt you and you shouldn't do it at all. I personally never did something like this with amount of money I was afraid to lose, even if it was frozen, I would have been fine since it was a small amount.