Edit: My bad English. I tried to rephrase this reply.

But the blog post is 2 years old and not part of the application. Since then new users started using the app. Most people don't read blog posts, if nothing big changes. Was there never a popup message, in example after a regular update, to inform about upcoming huge changes? So that people do not get surprised. The app description should have this information very clear and prominently on the top. No current user should be in a position that the app changes like this.