Helpful offers a simple spam protection without attacking the privacy of some countries. The spam protection can be disabled with the filter helpful_simple_spam_protection.

If you place this snippet in your functions.php the spam protection will be disabled.

<?php
/**
 * This can be used to disable Helpful's simple spam protection.
 *
 * @param bool $status default protection status (true).
 *
 * @return bool
 */
add_filter( 'helpful_simple_spam_protection', function( $status ) {
	return false;
});