Interesting. I never worked in Android, but did in Chromium & Chromecast code bases. Biggest difference with Google3 was honestly in the tooling. Style guide was fairly close, maybe a bit more conservative. Also the lack of the core libs that eventually became Abseil.

I work full-time in Rust these days and everytime I go back to working in C++ it's a bit of a cringe. If I look long enough, I almost always find a use-after-free, even from extremely competent developers. Footgun language.