Plugin Violates the WordPress plugin submission guidelines

By the way you can remove that from the admin menu without hacking that plugin.

Create a new file in wp-content/plugins named remove-per-advert-menu.php and put these lines in it.

<?php
/*
Plugin Name: Remove PER admin menu advert
Description: This plugin removed the Page Expiration Robot advertisement from the admin menu
Version: 0.1
*/

add_action( 'init', 'mh_no_menu' , 15 );
function mh_no_menu () {
        remove_action( 'admin_bar_menu','per_admin_bar_menu', 1000);
}

Activate that new plugin and the advertisement link will be gone.

Edit: Whoops! That only does it for the admin menu (natually). I fix.

Edit no. 2: Fixed again. The hook into init is probably wasteful but that plugin now works and removed the advert link.

So, if I understood this will still be visible to registered users. And in the Admin Dashboard will be hidden.

Nope. I fixed it. The added menu will be removed in all cases now and invisible to all. 😉

However, this type of advertising should not be there.

I agree, but I am not part of the plugin team. They work really hard. 😉 Send them the details and the plugin team can make a determination.