Bandwidth requirements of Cloud


I am having a problem with understanding the following text:

The bisection bandwidth requirements for a centralized cloud

solution are staggering, especially since most data acquired

by IoT devices can or should be processed locally

and immediately discarded.

I got it from the following paper:

Cloud paper

Bandwidth requirements of cloud are overwhelming in the context that IoT devices should locally process and discard the acquired data.

I can’t understand if the IoT devices are themselves processing the acquired data why bandwidth demands are increasing?