All of these devices have been reverse-engineered and packet sniffed to death, and no one has ever produced any evidence that they're doing anything other than

All of these devices have been reverse-engineered and packet sniffed to death, and no one has ever produced any evidence that they're doing anything other than what it says on the box. While I do appreciate that the cited sources in their paper, I would have appreciated actual information security papers rather than mainstream media articles.