It would be great if the images could be served with the proper Access-Control-Allow-Origin headers so that we can do some read-backs on it, e.g call getImageData() or toDataURL() from a <canvas>.
Would definitely be useful for StackOverflow, where for years we had to workaround that issue by using other services like dropbox, or other images like the ones coming from Wikimedia, but I guess this could also be useful to a couple other sites.