Yes, I agree if ruqqq brands it as just-another-funny-app then perhaps there won't be any copyright violations, since 9GAG steals content from other sites, stealing content from them won't amount to any copyright violation. In my opinion unless 9GAG specifically says that the user-supplied content belongs to them, then it doesn't, but the terms here say something on those lines: http://9gag.com/tos
Their TOS makes it pretty clear that the user-supplied content doesn't belong to them, under section 3 "Subscriber Content":
> Subscriber shall own all Subscriber Content that Subscriber contributes to the Site, but hereby grants and agrees to grant 9GAG, Inc a non-exclusive, worldwide, royalty-free, transferable right and license (with the right to sublicense), to use, copy, cache, publish, display, distribute, modify, create derivative works and store such Subscriber Content and to allow others to do so (“Content License”) in order to provide the Services.
And under section 2 "Site Content", they claim ownership of everything except user-generated content (emphasis here is mine):
> All materials displayed or performed on the Site, including, but not limited to text, graphics, logos, tools, photographs, images, illustrations, software or source code, audio and video, animations and Themes (as defined below), including without limitation the 9GAG, Inc Template Code (as defined below) (collectively, “Content”) (other than Content posted by Subscriber (“Subscriber Content”)) are the property of 9GAG, Inc and/or third parties and are protected by Hong Kong and international copyright laws.
Even if they did try claim ownership, one can't transfer a copyright they don't hold, which is the case for most of 9GAG's user-supplied content.