As of iOS 6.1 (2013), Apple said APNS had delivered over 4 trillion notifications already. A 2018 paper [0] claimed (with an admittedly-small sample size) that

As of iOS 6.1 (2013), Apple said APNS had delivered over 4 trillion notifications already. A 2018 paper [0] claimed (with an admittedly-small sample size) that people receive on average 56 notifications a day (delivered, not necessarily interacted with). It's almost 2024. Even going off those old numbers, assuming 2 billion active devices [1], APNS would be delivering close to 41 TRILLION messages a year, and likely growing. That's a lot of pepperoni, guys. Expensive pepperoni. Just some food for thought. https://dl.acm.org/doi/abs/10.1145/3229434.3229445 https://dl.acm.org/doi/abs/10.1145/3229434.3229445 [0] https://www.statista.com/statistics/1383887/number-of-apple-active-devices https://www.statista.com/statistics/1383887/number-of-apple-... [1]