Its some streamer chat integration system. https://beam.pro/
Anyhow, CDDA isn’t Java based, so hooking into the game to allow sensible monster spawning would require some work to build up something for the two to actually talk with. Movement wise, could probably just falsify input, but the Cata approach of “declare intent, declare direction for intent” for most actions would make it even harder to actually use than when twitch tried to play Pokemon.