Basically, Primal hotlinks for every URL thumbnail. If a website, like blockdyor.com, has the hotlink protection, the image won’t be shown. https://developers.cloudflare.com/support/more-dashboard-apps/cloudflare-scrape-shield/understanding-cloudflare-hotlink-protection/#:~:text=Hotlink%20Protection%20prevents%20your%20images,from%20visitors%20on%20another%20site.