According to an unnamed, former Apple employee, "The #1 most difficult [reason] to leave the Apple universe app is iMessage... iMessage amounts to serious lock-in."
The Real Reason iMessage Will Never Be on Android
Fact: Apple's iMessage is the only non-cross-platform messaging service. Now, company emails cited in court docs from Apple's App Store battle with Epic Games reveal why we'll likely never see iMessage on Android. Here's the real reason, and why Cupertino's strategy might push one PCMag editor to Android.