User blog comment:Rappy 4187/Technical Update: February 25, 2014/@comment-2212553-20140226145917/@comment-126761-20140227154120

It was very rarely used - it pulled images from RSS feeds for use in galleries and slideshows. Unfortunately, it had some technical issues which meant continuing to support it would have taken time away from more important work. The RSS2Wiki extension is unaffected.