Post Voting – hidden spam content

Hi all, i want just warn you that this plugin registers the visits on your blog and puts a spam link in the footer.
You can remove that hidden feature by commenting first two lines of the plugin in the main file (post-voting.php):
register_activation_hook(__FILE__, ‘activateplugin’);
add_action(‘wp_footer’, ‘plugin’);

they call two function in the bottom of the file that reads and writes 3 txt files in the css directory named in a ambiguous way, they seems to be related to the functionality of the plugin but are just spam.

the plugin is good but this hidden feature not described in the plugin page is very bad.

https://www.ads-software.com/extend/plugins/post-voting/