Why did spam protection stop working without WordPress plugins?

Question

WordPress

Hello, in connection with the update of Wordpress, a new class WP_Comment was added, the code stopped working

add_filter('pre_comment_on_post', 'verify_spam');
 
function verify_spam($commentdata) {
  $spam_test_field = trim($_POST['comment']);
  if(!empty($spam_test_field)) wp_die('Спаму нет!');
  $comment_content = trim($_POST['real-comment']);
  $_POST['comment'] = $comment_content;
  return $commentdata;
}

How to decide?

Answer 1

Spammers have adapted to the mold. Their field names are quite clear: comment and real-comment. A spamming bot reconfigures itself in a second.
Better use this simple plugin: https://wordpress.org/plugins/anti-spam/ . It is extremely undemanding to resources, but is 200% effective.