Does nothing without payment

This plugin does nothing by itself. You have to sign up for the plan. The settings page is just a sign-up form to submit your details..

There’s a “10 day free trial” but it requires credit card info and auto charges you after the 120 days.

So basically, useless unless you sign up and pay after 10 days, it’s completely useless. And the cheapest plan starts at $250 p/year, so it’s not cheap either.