Teams editing Markdown content waste time passing files around and managing conflicting edits. Word processors have real-time collaboration, but Markdown tools lag behind.
Build a web app with Google Docs-style co-editing, inline comments, and approval workflows specifically for Markdown. Include TextBundle support for rich media.
Sell subscriptions to documentation teams, especially in tech and academia where Markdown is standard.
MVP could be a simple shared editing room with basic commenting. Add integrations (GitHub, Notion) later.
Risk: Existing editors might add these features, or users prefer to stick with Git-based workflows.