What's your position, what does this offer instead of a web-hosting solution, is it security, privacy? I like the thought of it being hosted outside of a pre-packaged vendor but that's only to satisfy my desire to help the underdogs above anything else.
Why would I want to use this instead of Medium?
Are you handling all the domain management (purchase, routing, etc.)?
What would it cost?
As someone who writes a lot of code how-tos, there is room for improvement. In my mind that improvement is largely around formatting and displaying/running code in the users reading environment.
Just my two cents.
The only way to succeed is to build 100x better ux in your app than ssg with fancy img, video, frames inserting etc.