I just happen to be a part of a particular discord server that is essentially a fan development group for a long-closed MMORPG. There’s been a fan project to revive it ongoing for many years now (original source code is lost at this point) and there is a playable version of the client, but it’s little more than a glorified chat room with some clothing/animations for your avatar.

Someone just happened to ask about game/chat encryption in the discord server and the response was that there was a form of encryption for chat messages, but more importantly, it was an obscure game that nobody would think to monitor for traffic in the first place.

That got me thinking… there have already been things like the Minecraft Uncensored Library where you can download a map that has banned literature stored on it that would normally be flagged by surveillance states, but since it’s all contained within a file that runs on a game program, it’s impossible to track. The game itself is a form of obfuscation.

Theoretically, one could log on to a game service that has one foot in the grave (or set up a private server, if the service is no longer running) and you would have plausible cover from anyone who would be spying on your traffic (they’d just see you as logged into a game, sending packets back and forth) with the added benefit of encrypted private messages that you find in just about every modern multiplayer game.

I think your idea is good too, but I don’t know enough about linguistics to be able to say how difficult this would be, but I imagine anyone determined enough could figure it out. The last time I remember hearing about a “language” being built from scratch was the Phyrexian language from Magic: The Gathering, which is getting more fleshed out over time as hints and clues about the syntax and phonics are revealed via known/confirmed English translations.