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.
This makes me laugh. Not at you, but at the cycle. This was the convo years ago when this was possible, but getting consumers to trust a 3rd party like PalmOS (which was actually pretty darn good compared to android) is practically not possible.
App devs only care about platforms with enough users, users only care about platform with enough 3rd party devs support.