The Wikimedia Foundation decided to release this update after deleting nearly 250 accounts for which they believed were connected to a public relations firm that was editing and writing articles on the site. Wikimedia believes that unidentified paid editing is a form of Black Hat SEO which is both bad for Wikimedia as well as the volunteers and readers. This practice was having an alarming effect on how valid and reliable the information on each page was, leaving the community with a number questions left unresolved.
The change to the website was almost immediate. Wikipedia notified every user through banner messages through every Wikipedia project.