I'm signed up in any case.
My initial target is short-form content such as blog posts and essays. I'm going to wait to see how that goes to decide what to focus on next, but odds are that it'll be more structured content like academic papers or technical reports.
I'm definitely not ruling out an eventual focus on creative writing, but it'll take a bit for the system to get to that stage.
That said, I'm designing it with the ability to ingest annotated writing samples of any sort, so it's possible that a wider range of writing types will be supported sooner than expected.
I had, in the past, also been thinking a bit about how the system could work offline because it would avoid a lot of security issues for something like a medical office that wants to create content that's then copied into a medical records system.
My initial thought was to bundle a local copy of the server with pre-trained models, but that becomes problematic on mobile clients. I'm writing the server in Go, so if I go that route I'd probably need to reimplement parts of it in another language and avoid using any remote APIs.
So the answer is: very likely yes, but not initially. You've definitely moved the functionality up my planned features list.
I always prefer a Free software/open source solution - but I'm not sure how you'd monetize that. Maybe charge for the app (ios/android) - and provide a free/open self-host server solution, along with a subscription service and a web client? (The payment for the app would also grant access to the subscription, and for those that didn't want to self-host/wanted to support the project could pay for the subscription and use the web SaaS solution?).
I've been an OSS user and supporter for a long time. I don't think I'll be open sourcing the core system anytime soon, but I'm very likely to release any useful NLP or ML-related libraries that are created as part of this project. Not sure what those will be or when they'll be ready, but I do have a mind to give back to the OSS community.
Not sure what kind of income they see, though.