Kajabi

Kajabi is an all-in-one platform designed for creators to build, market, and sell digital products such as online courses, coaching programs, memberships, communities, and podcasts. It provides tools for content creation, marketing automation, sales, and analytics, enabling entrepreneurs to monetize their expertise and grow their online businesses.

Kajabi is a strong match for the concept of an online publishing platform, although its primary focus is on selling online courses, coaching, and memberships rather than general long-form articles like Medium. It offers a comprehensive suite of tools for content creation (including a rich editor for courses and newsletters), monetization through various product types (memberships, courses), community engagement (comments, communities), and analytics. While it doesn't explicitly mention an 'algorithmic feed' for content discovery, it does provide tools for content organization (tags/topics) and user profiles. The platform's emphasis on creators building businesses aligns well with the idea of enabling writers to monetize their content.