I was referring, in a convolute way, to the fact that all the data collected have been/will be used to train the models that will allow offline voice recognition (like the one google has shown at i/o last week).
I think that this is an important point. Obviously there's more computing power available in Apple/Google/whoever's data centres than on my device, and I'm sure that is, or at least was, a concern; but I also don't believe that they are indifferent to the utility of sitting on such a huge volume of user-submitted, real-world data.