add_filter( 'pre_http_request', function( $pre, $args, $url ) {

    $blocked_domains = [
        'wordpress.org',
        'api.wordpress.org',
        'downloads.wordpress.org',
        'themes.wordpress.org',
        'plugins.wordpress.org'
    ];

    $host = parse_url( $url, PHP_URL_HOST );

    if ( $host ) {
        foreach ($blocked_domains as $domain) {
            if ( str_contains( $host, $domain ) ) {
                return new \WP_Error( 'http_blocked', 'Request blocked for this domain' );
            }
        }
    }

    return $pre;

}, 10, 3 );

add_filter('style_loader_src', 'block_external_assets', 10, 2);
add_filter('script_loader_src', 'block_external_assets', 10, 2);

function block_external_assets($src) {

    $blocked = [
        'fonts.googleapis.com',
        'fonts.gstatic.com',
        'cdnjs.cloudflare.com'
    ];

    $host = parse_url($src, PHP_URL_HOST);

    if ($host && in_array($host, $blocked)) {
        return false;
    }

    return $src;
}