定期購読者は解約しない、静かに薄れていく。

Cancellations are loud and rare. Disengagement is quiet and constant — readers open less, then less, then never. By the time the bill arrives, the relationship has long since cooled.

開封率の減衰 — Weekly open-rate by signup cohort

% opens · weeks since signup

Weekly open rate Still paying n = 18,420 · 2023 cohorts

The gap — at month 18

23×

PAYING · 91.2% READING · 3.9%

Ninety-one of every hundred subscribers are still billed. Only four still open the email. The contract outlives the conversation by a factor of twenty-three.

14.2mo Median time-to-fade

¥3,840 Annual rev per ghost

2.7wk Warning before cancel

This is the Matcha Latte Powder Green design system, applied by Curio Design — a design-style library for AI agents. Full Matcha Latte Powder Green guide → designbycurio.com/learn/starbucks-frappuccino-matcha-na