## The Hyper-Casual Voodoo Math
Hyper-casual mobile games (like "Flappy Bird" clones or idle clickers) have zero Monthly Retained Users and zero In-App Purchases. They exist entirely as massive User Acquisition arbitrage machines. You buy a user for $0.45 from TikTok Ads, bombard them with 15 ads in the first 24 hours, extract $0.52 of eCPM revenue from them, and let them inevitably uninstall the app happily.
### FAQ
**Q: What is eCPM?**
A: Effective Cost Per Mille. It's exactly how many dollars the Ad Network (Google AdMob, AppLovin, IronSource) pays you every time your app successfully renders 1,000 video or banner advertisements to your playerbase.