When the story broke in 2016, only about 10% of Android phones were encrypted vs about 95% of iPhones.
https://arstechnica.com/gadgets/2016/03/why-are-so-few-andro...
At that time, Apple had included dedicated hardware in their SOC to handle device encryption for several generations, but enabling a software implementation of device encryption on Android caused performance penalties.
>there's a very significant performance penalty that comes with enabling FDE, with a 62.9% drop in random read performance, a 50.5% drop in random write performance, and a staggering 80.7% drop in sequential read performance.
https://www.anandtech.com/show/8725/encryption-and-storage-p...
FDE was pretty late and performed slow on early Android, among other issues.
The structure of Apple's revenue sources makes it a sure fire bet to do vs Google.
If everything you do in your daily life is recorded that is a significant privacy issue. More so than your private photos/text messages and GPS coordinates alone.
Apple is working on AR glasses, and is significantly promoting AR SDKs with their newest iOS releases. It's very easy to see why they take this privacy stance today.