Free-Trial Abuse via Serial Apple IDs Triples AI Inference Costs for Indie Apps With No Per-Device Defense

Summary

A solo AI app team discovered their image-generation bill had tripled in 9 days with flat installs and flat revenue: one device had produced 14,178 generations — more than all other users combined — by starting 9 free trials from 9 different Apple IDs and cancelling each before conversion, costing roughly $1,900 with zero revenue. The root cause is structural: trial limits are enforced per account, not per device, and the app cannot quietly cap usage because it advertises 'unlimited' and app review plus angry reviews punish that. Legitimate defenses (per-device caps) risk blocking real families sharing one iPad, so founders are left guessing at per-device/per-payment-method/daily-limit combinations. Existing fraud and chargeback tools are post-hoc financial tools, not pre-emptive abuse detection for AI products where every abusive free generation costs real inference money. There is no affordable tool that fingerprints devices/accounts/payment methods, flags serial-trial abuse, and enforces limits without punishing genuine users — an unsolved, financially existential pain for indie AI developers.