FanFiction

FanFiction.net is a well-established online platform for fan-created stories, aligning with the concept of an online publishing platform. It provides tools for writers to create and share content (rich-text-editor is implied for story submission), and a robust system for readers to discover and engage with stories (tags, search, community features). While it doesn't explicitly mention monetization for writers or a sophisticated recommendation engine like Medium, it fulfills several 'must-have' and 'other' features related to content creation, distribution, and community interaction. The platform's focus on user-generated content and community interaction strongly matches the core idea.