My understanding of how the surveillance works is everything is swooped up like in a gigantic vacuum cleaner.
Then some sort of AI digs through all the dust particles and picks out ones that meet whatever criteria are programmed into it.
They in turn are put in a huge pile and at some point some human looks at them after watching their favorite porno videos.
;-)
I think you’ve got it.
If the human thinks the person is of interest, then that person is specifically targeted.
Even something as benign as saying “I’d like to attend a Trump rally” could get the special treatment.
Most of us on FR are targets anyway, so that statement above is really a nothing.