One-page reference for the engagement-to-retention loop: the leading engagement indicators (Play Time/CTA-2066, completion, time-to-second-session, DAU/MAU stickiness), how to read a cohort retention curve (shape, cohort comparison, the smile), the voluntary-vs-involuntary churn split with the worked dunning-recovery math (1M subs, 0.86%, ~$619K/yr recoverable), and the quality and privacy guardrails (QoE-as-retention-tax, VPPA 18 U.S.C. § 2710, GDPR).
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