Avoid hotlinking images with Cross-Origin-Resource-Policy

An image on your site can be directly included in other sites. You end up with the costs of hosting and serving the image, while the other sites gain the benefits of showing your nice image on their page. With the response header Cross-Origin-Resource-Policy it is possible to inform the browser that images should only be usable by the same site or origin as the image, thus making hotlinking impossible.