This website, fastimg.net/wallpaper-search, has somehow made almost all deviations available for download as a wallpaper, even if they are set as non-downloadable. THIS INCLUDES YOUR DEVIATIONS!

It's an automated script set to search for images online, and make them easily downloadable for people. Technically they are not doing anything illegal: The size available is the size made available by you in the preview (so the size that people can download by right-click, even if you put the deviation as non-downloadable). The DA watermark is not even removed.

However, they only state your name if you used that name in the search in the first place, and they don't provide a link. Moreover, since this is an automated scrips, they show all deviations, no matter their rules. This includes material where it's clearly stated that it should not be used outside of DA. The site even gathers images from user stash folders and dropboxes and even other sites such as tumblr.