This plugin could be awesome, but the idea behind it makes it fail.
Well-coded, very customizable, SEO-friendly with Schema.org - however there is one big problem: As a plugin user, you lose the rights to do anything you want with your content. All ratings are stored on a server run by the business behind this plugin - instead of storing them in your own WordPress database. Imagine the business fails or something else could happen - you would lose all your ratings as you would have no way importing them into another rating plugin. They have the power to do what they want with it. While this is basically the way to go for today's social networks, I am completely against this approach in terms of WordPress.
In my opinion it is perfectly fine to provide commercial plugins for WordPress, and it is also fine to regularly check the user's license. But practically owning the user's website's data (or parts of it) is a no-go. That's why I can only give this plugin a single star.