You raise a good point: it is in Google's interest to maintain a monopoly on as much data as they can.
Perhaps they could have made a ton of money, launching drones as a service for the likes of Amazon and the postal. Perhaps they should have monopolized the skies if the hobbiest drones werent interfering with the commercial prospect this technology offers.
Google is still in a good position to integrate this technology with their maps...
(Just thinking loud..)
Considering that Bezos understands drones and Google is competitor to Amazon and has been missing the quiet revolution coming, this isn't a surpising salvo.
[1] http://www.nbcnews.com/technology/private-drones-pose-privac...