I think it is because that the application framework of Google Android is JVM. And JNI is so annoying that binding Kotlin and other system-level programming language other than C++ like Rust, Zig for a Android app is so hard.

For game engine developers that works for their game targeting Android, especially for commercial mature game, you have no choice but Unity engine. And take a look at Google announce [a donation of $250,000 to the Rust Foundation](https://www.linkedin.com/feed/update/urn:li:activity:7376353...) but there still constraint on using Rust library for Android app.