Maybe they literally just don't care about how much traffic they put on your network. Maybe the thought is "1 tb of traffic internally is very low utilization of the network over the course of a month".

Whatever they're trying to accomplish with these scans would probably be impeded in some way by this much volume. Like it'd compete with the link it's using to phone home or overload whatever on-device processing it does with that data. The man in the article who discovered this called it a bug, I agree with him.