"Published" may not mean the same thing to everyone. How different are Hubs from Blogs? Are Blogs published, or not?
Call me old-fashioned, but the definition of 'Published' seems to infer some sort of a commercial application; you PAY (or get paid, ideally) for some one to be able to create a product (book, newspaper, magazine, e-book) that has the words you wrote in it.
In short: Published means that what you wrote ended up with a Library of Congress Classification Number on it somewhere.
Hubs seem like a great place to get practical writing experience and feedback, and the potential of a small stipend from the advertising that supports this site almost qualifies as reimbursement for services, but I'm not convinced that it rises to the level of a quid-pro-quo contract for Services.
There may need to be a new Tier of Definition created to bridge the gap between Published and Non-Published that would accurately describe works created and available online directly to the public to see/read/enjoy.