Earlier quoted context omitted.
It's been a (very) long time since I worked in Android OS land but at the time I could see effects of them actively moving projects from GCC to Clang. I always picked up the outsider impression that it was their preferred C++ toolchain. First I've heard of them abandoning it
There is a big push for their proprietary language "Carbon". Clang is way behind on implementing most C++20 features.
Also it isn't even proprietary[1]
1. https://github.com/carbon-language/carbon-lang/blob/trunk/LI...