Yeah, I don't know if it's even possible. What I'm saying is I can't imagine how Bell would see internal lan traffic otherwise. The device has nothing to do with measuring or calculating usage. That's done on a separate piece of equipment far from the user's premises.
This just doesn't make any sense on a lot of levels.
But I will say this. If an ISP was able to cook up some scheme to measure lan traffic and bill the user for it... I would surely expect Bell to be the first, and the leader, in such an endeavour.
Mike