I think it's probably too early to call Gfycat the "winner", and I don't necessarily see why there isn't room for multiple providers. There's no reason image sharing needs to be a "winner-take-all" game; in fact, it behooves everyone if there is a bit of diversity in the space. I understand that reddit (the organization, not only the community) likes to aggressively favor single image sharing vendors, and that sucks, but surely there are other places where such a site can find usage.