Do you know id there is a SEO advantage if someone embed some images from your server? But an iframe? A .js file?
It's basically link to the server the image is hosted. They'll rank better in google images which attract a lot of visitors. Iframe is html. It is read in the source code thus it also counts as a link to the original host. A js file can be read but when it's obfuscated it can't be executed to reveal the source code. So js files whom embed images are counted as links to the original host. Obfuscated js files however are not being executed to reveal the source code as of yet. So it won't give you a link. The downside all these methods cost you bandwith. You can play a little joke tho on the people whom steal your images. replace them with gay porn that has the same name as the original image. You can also block people from using your images in the htaccess file.