CDNs (the kind where a third-party domain shows up in your HTML) have been largely pointless for a long time anyway and were probably purely around for generating metadata in the last couple years, since browsers segregate all caches by top-level origin. So ten years ago "but what if the user already was on a site using the same exact version of jQuery/font/whatever has already been to another site using the same CDN, then that might be cached and save 50 kB" turned into "it will always be downloaded" years ago.