I don't see how its not a big deal. If all messages are seen by my phone, just to be inspected and discarded, then my phone is consuming bandwidth and processi

I don't see how its not a big deal. If all messages are seen by my phone, just to be inspected and discarded, then my phone is consuming bandwidth and processing cycles on irrelevant data. And unless my phone has free bandwidth, and the processing cycles don't consume power (or it has infinite power), how can it ever not be a factor?