Well, carps. No wonder. The dirlink to the image is a data:image/png;base64 URL. Looks like it has to be fetching the info through URL, and uploading manually.
No. They seem to be using some weird video format instead of actual gifs (or something), and you can't simply right-click save-as.
Dang youre right. I tried to save one of these gifs from pixiv and I couldnt. This has already become the new big thing on pixiv too. Could this be a bad time for danbooru?! Find out next time...