Hi @dedushka,
Thank you for your review.
We have provided significant features in the free plugin that will help anyone optimize their WordPress site for search engines. We truly believe that the free version provides great value given the features available and the support provided by us and we’re committed to maintaining this for our users.
There are features that are only available in our premium plugin and we provide details of these features within the free version so that users know that they exist, what they do, and how they can benefit your SEO. We’re not forcing anyone to upgrade, we just want to ensure you know what’s available so that you can make an informed decision.
We have over 3 million users of the free plugin and some have been using it for over a decade and are very happy to continue using it knowing that, if there’s a feature that’s added to the premium plugin, they can learn about it and decide whether it’s of value to them.