Apps that host marketplaces on Shopify- Apps that connect merchants to marketplaces can't host those marketplaces on Shopify. Apps also can't let merchants turn their stores into marketplaces. To learn more about best practices for marketplace apps, see Build a sales channel.
Specifically, in "Apps also can't let merchants turn their stores into marketplaces", what constitutes a "marketplace"? Could someone clarify?
Are specific aspects of a marketplace not allowed, or is more of a high-level prohibition around not allowing apps to have their own 3rd-party sellers, like on Amazon Marketplace?