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.
It's been that time for years. But it's easier said than done. The closest we've currently got are the various phone-targeted Linux distros out there. But they're not quite ready for serious usage for me; at least not on the Pinephone. Still, that's where to put your time & money if you're serious about wanting a change.
This is true for both the engineering and business sides. Cyanogen’s failure showed that it ultimately doesn’t matter how good your software product is if your business side of things is poorly run. Same with the Pebble smartwatch - amazing product, terrible back office.