CDN

composer require npm-asset/yaireo--tagify:4.35.4

/**
 * Implements hook_library_info_alter().
 *
 * The tagify module loads Tagify from cdnjs.cloudflare.com. Serve it from
 * npm-asset/yaireo--tagify in /libraries instead, so no request reaches a
 * third party and the widget keeps working behind restrictive firewalls.
 */
function my_module_library_info_alter(array &$libraries, string $extension): void {
  if ($extension !== 'tagify') {
    return;
  }

  // Assigning replaces the CDN entries. The npm package ships an unminified
  // UMD build and no *.min.css; Drupal aggregates them either way.
  $libraries['tagify']['js'] = [
    '/libraries/yaireo--tagify/dist/tagify.js' => ['minified' => FALSE],
  ];
  $libraries['tagify']['css']['component'] = [
    '/libraries/yaireo--tagify/dist/tagify.css' => ['minified' => FALSE],
  ];
  $libraries['tagify_polyfils']['js'] = [
    '/libraries/yaireo--tagify/dist/tagify.polyfills.min.js' => ['minified' => TRUE],
  ];

  unset($libraries['tagify']['remote'], $libraries['tagify_polyfils']['remote']);
}