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Why do criminals use their own encrypted messaging platforms, instead of using any of the recommended apps?
(www.europol.europa.eu)
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I've heard of criminals using MMORPG DM's to communicate back in the day, not sure what happened to those guys.
Another way to stay under the radar. IIRC there was a case where information was passed on an image board by means of using random-looking filenames that actually encoded messages.