Steganography isn't new and Al Queda guys were using these techniques to coordinate amongst themselves using messages hidden in pictures on message boards back in the 2000s. I was playing around with it in the '90s and it's older than that.
If someone wanted to use it to entrap us all they would make it uncrackable. Hypothesis: if you turn someone in for encrypted kiddie porn but you are the only person in the world with the key to break the encryption you might just become a suspect.
If someone wanted to use it to entrap us all they would NOT make it uncrackable.