You can't use Flickr as a public CDN AFAIK. Their terms require if you use flickr to host an image displayed in another page that page must provide a link to th

You can't use Flickr as a public CDN AFAIK. Their terms require if you use flickr to host an image displayed in another page that page must provide a link to the photo's page on flickr. Flickr also only allows photos, illustrations and screenshots. (and video). Nothing else. These terms are not spelled out in the ToS but in their community guidelines and faq There are plenty of examples of people having their accounts closed for not following these rules.