RekUnless money is changing hands this seems like too much hassle for too little gain. People are just uploading a bunch of pictures they like, not sure what you even want out of this.
When you upload art to the game hubs, there is a checkbox that says, "I certify that I created this artwork."
When people upload work that is not their own it is copyright infringement. Many of the original artists are not employed by any company as an artist, and work from home. When people post their art without permission or credit, that's revenue lost.
I don't think anyone should want anything from doing what's right. Sorry if copying and pasting the information I put up is too much work for you.