The big assumption here is that GCHQ were listening to *all* of the "crime lords", and that some of them have now stopped using unencrypted email or phone to communicate and have "disappeared".
How do GCHQ know that there were no "crime bosses" using communication methods that they weren't monitoring?
Personally I know plenty of low level dealers who wouldn't discuss their trade over any electronic communications, so at least one or two of the higher-ups must have been equally sensible.
Biting the hand that feeds IT
