We kinda tried with our game ( https://itch.io/jam/gmtk-2019/rate/462003 ) but then realised we weren't gonna pull it off, so we just simulated it haha
We spent more time on writing fake usernames than the AI and... it miraculously works. We felt like having a fake multiplayer game would be a good twist on "Only One" too!
Now I am curious whether someone actually managed to pull it off. Have you seen any multiplayer games?