Which psychological strategy has been documented as MOST effective for streaming services in building long-term customer loyalty?

Streaming platforms like Netflix, HBO Max, Disney+, and others have transformed how we consume film and television content. Each platform employs sophisticated customer loyalty strategies to keep subscribers engaged and reduce churn. This trivia question explores the psychological tactics used by major streaming services to maintain viewer loyalty in an increasingly competitive marketplace.

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Content exclusivity (original programming that can't be found elsewhere)
Personalized recommendation algorithms that suggest new content based on viewing history
Social features that allow users to share viewing experiences with friends
Reward programs that give subscribers points for consistent viewing patterns