Android shouldn't be considered Open Source anymore, since source code is published in batches and only part of the system is open, with more and more apps going behind the Google ecosystem itself.
Maybe it's time for a third large phone OS, whether it comes from China getting fed up with the US and Google's shenanigans (Huawei has HarmonyOS but it's not open) or some "GNU/Linux" touch version that has a serious ecosystem. Especially when more and more apps and services are "mobile-first" or "mobile-only" like banking.
Apple and Google conspired to never allow that to happen. They've pushed Microsoft out of that sector. Microsoft! Name a bigger challenger.
I went through 3 generations of Windows Phone devices for work. The only thing phenomenal about them was the Zune-style UI. They were buggy and unreliable, even for the few apps they had.