Thank you for your quick and detailed reply. You are correct, there a lot of features that do not allow spam, however, 200K pages have been created since these users registered (even though I deleted those users). I even asked Moz.com to recrawl the site and they are still there.
The page I shared with you does not contain spam, however, it is a page that I did not create. Tens of Thousands of duplicate pages have been created. Is there any way to delete them?
Thanks again!