That is true. They often used the world of warcraft. The idea was that so much private chatter went over the servers they would never notice them talking about their actions, though, they were in code. Many terrorist groups have used games to chat and plan things using code. After all, who is gonna think twice about a group of people playing video games, planning attacks? A while ago I realized you could probably communicate in Minecraft by literally building with blocks and avoid direct chatter all together so long as you know the coordinates of where the message is.
I seem to recall talk that terrorists were using COD4 to send messages in-game using Morse code from gunshots in the game. I’m not sure if it was ever something that was verified or just another “video games are evil” newsreel. Especially since in the examples of CS bullet holes they disappear after a round or within minutes. And that kind of random data is almost certainly thrown out and practically unrecoverable after the match ends.
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