Echelon doesn’t seem to work

A story about how the British intelligence services have been closing down al-Qaeda related web sites, Finger points to British intelligence as al-Qaeda websites are wiped out (from the The Sunday Times, July 31st, 2005), comments that automated electronic intelligence gathering systems like Echelon don’t seem to work. In other words text-analysis systems don’t work if people want to subvert them by using simple codes or spamming the net. See my previous posts on Carnivore Documents.
Does this mean it is unlikely to be helpful to students of textuality?