If spying on citizens was a business
Wouldn't it be better to hook into a few major desktop players.
You have your Adobe Acrobat type programs that are wide spread and lots of chatty client/server communication.
Better yet, you can your anti-virus programs. These also have lots of network activity. Better yet they come with escalated system privileges.
And the more obvious. You have Windows/OSX. Both closed source and are now always phoning home.
I realize you can't do as much on a single system as you can with an aggregated data set back at your main server. But it seems like you only need a few bytes of flags to be able to deduce that this system is worth looking into further.
Sometimes less is more. If spying on citizens was a business... Forget about downloading all the data in the world. Reduce it at client side and send back the results.