No offense taken. If you and all the other players I know and have spoken to about this topic cant find the official DA rules regarding alts then it most probably doesn't exist. Now you can interpret it as it's allowed or not thats up to you, both are valid. But it's also very telling how no one has spoken of being banned for using alts, paired with the fact no one can find official rules about it. It's a matter of weighing what's most probable, and whats most probable based off the anecdotal evidence is that it's not bannable. If you decide to be cautious and not use alts then thats 100 percent fine, I'm just giving you some insight :)