Everything you say is correct, at the very least technically. I still feel meetup can do better here. Why not just disable the group? To everyone else it looks as though the group is gone or at least indisposed, but admins can still log in and see things while the issue gets resolved? This would also give meetup a chance to indicate to the admins why the group was disabled and options they can do to fix it. Potentially a win/win for everyone, as the group could evolve into a profitable one with a little bit of coaxing/aid.