So it's a huge waste of money usable only against non-terrorists?

No, it's useful against terrorists whose trade-craft is less than perfect. That's many of them.

Its only really useful against non-terrorists, but that doesn't mean its a waste of money: if it is used to make money.

So maybe its being used to make money - i.e. targetting non-terrorists (i.e. industrial espionage) - precisely because it is a huge waste of money. Wow, its almost like the whole thing was just a bad idea in the first place - its become self-serving.

That's a pretty good summary.