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nindalf | on: Zig – Type Resolution Redesign and Language Changes
Same reason Android and Chrome and git and Linux weren't written in Rust when they started. Rust didn't exist. All of these projects integrate Rust now, after being single language projects for the longest time.

It's notable that the projects you mentioned mostly don't need to deal with adversarial user input, while the projects I mentioned do. That's one area that Rust shines in.

pjmlp | parent
Rust presence in Android is minimal, and not officially supported for userspace.

Android team is quite clear that Java, Kotlin, C and C++ are the official languages for app developers.

Chrome even has less Rust than Firefox.

Linux has some baby adoption, and it isn't without drama, even with Microsoft and Google pushing for it.

nindalf | root | parent
Rust will never be in Android user space, because it's not competing with Kotlin. Kotlin is already excellent there. Rust will replace the parts of Android written in C++ gradually. That was always the plan. It feels weird and cope-y to move the goalposts to say it's not a big deal unless Rust also replaces Kotlin.

Chrome only needs to replace the parts of their codebase that handle untrusted input with Rust to get substantial benefits. Like codec parsers. They don't need to rewrite everything, just the parts that need rewriting. The parts that are impossible to get right in C++, to the point where Chrome spins up separate processes to run that code.

Rust is the future for Android, and it will become an important of Chrome and Linux and git (starting 3.0). That's just the way it is.