This plugin simply remove default Login Form from login page. If you are really sick of spam logins that are happening gain and again, then simply use
Before activating this plugin, make sure that Jetpack plugin is installed and you connect your WP.Com account with your site. If yes, then please activate it to use “WordPress.com log in”. To do so, just follow the steps below:
1. Go to Jetpack > Settings
2. Click Security
3. In the “WordPress.com log in” section, enable “Allow users to login this site using WordPress.com Account”