Hippo claims to be the world's first collaborative photo gallery. "Have your photos edited by your favorite Instagram artists! Some of Instagram's biggest creatives are using Hippo! Our editors transform your photos into entirely original works of art." + "On Hippo, creativity is collaborative. Feeling inspired? With Hippo, you have access to thousands of photos you can edit! Collaborate with users all over the world and make something beautiful."

It's a very cool idea, I've always explored different 'perspectives' of the same image. I am just not sure how sustainable it is to have someone (or a group of people) to edit pics for people on Instagram. Is there some kind of a business model?