Citation needed.
Do you suggest that the data is destroyed after it is deemed unimportant?
If not, that suggests a far more terrifying scenario in which the data is collected and stored in the event that it would need to be brought up at a later date.
That's what ignoring it means: it only exists in whatever fleeting capacity the local devices capture it, and the CIA has no interest in capturing or analyzing it.
Sorry, but I don't buy that they aren't in the business of data collection. I'll buy that they don't have the time to analyze everything if there's not a compelling need, but the data does exist and is readily available to be abused at any time.