It already exists. Search for “AI for creative writing”. Training suggestions based on the users’ own writing is going to restrict your user base to people who

It already exists. Search for “AI for creative writing”. Training suggestions based on the users’ own writing is going to restrict your user base to people who already have written extensively (less inclined to need help). And actually it will limit their expressivity instead of expanding it. I’d think that people don’t really care if it runs in the cloud (they trust the cloud with their emails…). Despite the “echo chamber” critics that are valid, this is still a good idea. Like a personal writing practice. Obviously not great if your goal is to be truly creative