Hey, thanks! I dont know about anything collaborative and for writing. https://aidungeon.io/ Maybe collaborative to play. And then there are a lot of writers exploring fine-tuning text models like GPT2 for personal use. https://twitter.com/MagicRealismBot is one of many examples. https://towardsdatascience.com/how-to-fine-tune-gpt-2-so-you...

Maybe you should make it!