comment-without-ip.php

<?php
/**
 * Plugin Name: Comment without IP
 * Plugin URI:  https://gist.github.com/glueckpress/74710e5954f12f4da164f810b7976529
 * Description: Removes a commenter’s IP address from new comments.
 * Version:     0.0.1
 * Author:      Caspar Hübinger
 * Author URI:  https://profiles.wordpress.org/glueckpress
 * License:     GNU General Public License v3
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */

defined( 'ABSPATH' ) && function_exists( 'add_filter' ) or exit;

add_filter( 'pre_comment_user_ip', '__return_empty_string' );