True, but it would be difficult for a random device to discover the group in the first place if they aren't being forwarded the packets. But really, this would

True, but it would be difficult for a random device to discover the group in the first place if they aren't being forwarded the packets. But really, this would just add one more layer of complication that doesn't buy you anything. It's not like this is security data. This is the kind of application where keeping it simple can help the reliability.