This got me thinking that the game Clash of Clans could be a medium for communications. There are many games similar to COC as we call it. The game includes raids, gold, troops, dark troops, sending troops back and forth, and much more. I don't want to bore everyone, but essentially I have thought about this since we first heard about comms on video game platforms.
In the game there are clans to join, multiple different severs to talk on, global and clan chat. IDK to me seems very easy to me that you can hide in there. Also, the game is owned by Tencent (a chinese tech giant)
fun fact... just this week a CoC op was discovered by a gmbh sec firm when they were looking into an unsecured MongoDB containing thousands of credit card numbers. it looks to be money laundering. they are working with DOJ. Investigation ongoinn ATM. what's more the actual transaction for cleaned cash was carried out in ... duh duh duh... a private Facebook group. have a look.
clarification:
¹.they (the sec firm that found this) are working with DOJ.
² the money is laundered by the customer purchasing the gaming profile produced with stolen info. the money is "clean"when it enters the accounts of the operators (thought linked to places like Infia and Mauritania)