They made very successful use of consumer-level tech to defeat military-grade tech, e.g. various uses of drones to deliver munitions, and GSM networks as beacons over enemy territory. No wonder: given their constraints, they jump on every solution that can work right now, with near-zero effort. While using a foreign-controlled tech is usually frowned upon, the US is not the side from which they particularly need to hide. I would rather see them using Signal though.