I hope a government or corporation would be smart enough not to use such a simplistic system to hide covert or confidential data. Then again most military drones were not encrypting their video feeds until rather recently, so who knows.
Intelligence agencies use the simplest systems of transmitting data because they're proven to work. Dead drops are another great example of what on the surface seems horrifically insecure (you want me to leave my intelligence in a public place for anyone to find?) but that in practice work extremely well.