Google quote from https://riscv.org/riscv-news/2024/10/risc-v-announces-ratifi...
> "Google is delighted to see the ratification of the RVA23 Profile," said Lars Bergstrom, Director of Engineering, Google. "This profile has been the result of a broad industry collaboration, and is now the baseline requirement for the Android RISC-V Application Binary Interface (ABI)."
AIUI both Google and Microsoft selected RVA23 as baseline.