If they are doing their recruiting in chat, it's better to ban them now and deal with the fall out. You may end up losing more members if you allow them easy access to recruit there than you will from any drama the ban causes. Be clear that such behavior won't be tolerated.
They chose to leave. You're under no obligation to let them guest if they're just using the access to poach members.
21-Feb-2016 23:58:52