I think there's also the "roll up a whole network at once" approach they prefer to take for things like this - hence nothing will happen for months/years whilst investigations happen in secret and then there'll be a day where you get 40 coordinated raids across 10 countries which lead to tens of people being arrested. Then of course there's another period of months/years where they have to work on the new stuff they've got from that raid and also preparing for trials, etc.