Freelancers, take note!
No longer limiting itself to media organizations means wider, more diverse content. Their guidelines for publisher qualifications are fairly broad, as well.
All Instant Articles do need to reference a web link, so if you participate you can’t publish exclusively on Facebook. It’s a simple enough thing to set up a target website for article distribution, then reference the site in your article.
In return, Facebook will give you around 70% of the revenue from ads sold within the post, with Facebook doing all the selling.