一部裝置用盡14,178次免費試用，圖像生成成本同期升至三倍
One device burned through 14,178 free trials while my costs tripled
圖像生成帳單在9日內升至三倍；Claude 查閲成本紀錄及訂閲資料後發現，一部裝置的生成次數超過其他所有用戶總和。該裝置透過9個 Apple ID 反覆開啟3日免費試用，因試用限制按帳戶而非裝置計算，每次都可重新取得不限量試用。團隊正加入按裝置設限，但希望避免影響共用 iPad 的家庭。
Our image generation bill basically tripled in 9 days. Installs were flat, revenue didn't move, no campaign, no launch. I spent two evenings staring at dashboards before it occurred to me to just ask.
I had Claude dig through our cost logs and subscription data. The answer was immediate: one device made more generations than all our other users combined since early October. It cycled through 9 different Apple IDs, each starting a fresh 3-day trial, cancelling before converting. Never paid a cent.
The problem was obvious in hindsight. Our trial limit checked per account, not per device. So every new Apple ID meant a fresh unlimited trial.
And yes, unlimited on purpose. Our paywall and listing literally say unlimited generations, and quietly capping something you advertise as unlimited is the kind of thing that gets you rejected from app review and a wave of angry reviews.
We're adding per-device caps now, but a lot of real families share one iPad and I don't want to block them. Per device, per payment method, a daily generation limit during trial—has anything actually worked for you without annoying normal users?
來源：DEV Community · dev.to