MemberPress

MemberPress is a WordPress plugin designed for creating and managing membership sites, online courses, and communities. It directly supports membership monetization through subscriptions and offers features for content restriction and dripping. While it doesn't explicitly mention a 'rich text editor' as a core feature of its own, it operates within WordPress, which inherently provides such functionality for content creation. The platform also supports community building and user profiles. However, it lacks a built-in recommendation engine or detailed reader engagement metrics as described in the concept, focusing more on the administrative and monetization aspects of a membership site rather than a content discovery platform.