Dual Acccounts allowed in WvW?
It’s his money so he can do whatever he wants with his accounts.
Multiple accounts and multiboxing is allowed. If the person decides to have an account on a rival server then that is up to them, it’s low of them to have to spy on your server, but as with the players who build useless siege to reach the cap, anet sees this as a valid style of play; even though if you ask me it violates their own Terms of Conduct.
What you cannot do is multibox and link your keyboard and mouse to both clients, eg if you press forward both characters in each client move forward.
Remember to buy the officially endorsed GW2 Steel Series Keyboard, it supports macros!
WvW, we only care if it affects the servers we play on.
There is a particular commander on a server that we play against that we highly suspect, but cannot prove, is tag watching against our server. He conveniently seems to know when to take towers and defend SMC. There was a hilarious occasion where we had a single player tag up and try to take a tower solo and the suspected commander was waiting with 80 players without that player even hitting the tower to cause white swords and was not scouted by the other server’s scouts.
Sounds like you should use this to your advantage. Send the lone tagged commander to a tower while bulk of your forces, following an untagged commander, attack your real target that the commander has drawn his defenders away from.
Some people (including me) have dual accounts to play on EU and NA as well. I wouldn’t want one of them removed.