Substack Rewards Ecosystem Activity With Discovery
In late 2025 Substack shifted its recommendation system to sequential modelling, said head of data Mike Cohen, and the platform now prioritizes on-platform behaviors like Notes, restacks, and comments. Substack reports recommendations generate 50% of new free subscriptions and 32 million app-originated subscribers over three months, with on-platform readers converting three times faster. The result: writers gain more discovery by building inside Substack but create platform dependency.
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