Originally Posted by
Delias
No, there is currently no way to prevent your members from joining other guilds.
Likely because such a feature would be extremely silly.
Guilds are basically chat rooms, telling someone they're not allowed in any chatroom but yours is just silly. Like telling someone they can ONLY play in your server in an FPS game, regardless of how many people are currently on it. But that's not for me to decide, I guess, it's for you guys to.
Either way, such a feature is not currently in the game and I should hope never gets added.
Edit: Oo, oo, I thought of another comparison,
it's like telling your friend to choose between being friends with you or someone else, and that he's not allowed to be friends with both. I always hated people like that. The only time those words came across someone's lips to me in my life, I told them that regardless of what my 'choice' would be, I did not want to be friends with someone who is that petty. They took it back a couple days later. Oh Jr.High School, you so silly.