Sure. GrapheneOS is the Android system with a huge amount of removed bullshit baked in, which provide all the meaningful privacy changes needed for a better mobile phone.
The point is to abandon Google in every way that is reasonably possible. I obviously don't see much of a difference with Apple, nor Microsoft. What options remain that are reasonable in the effort applied and remain plausible in a competitive world? My answer was GrapheneOS. Yours is?
> What options remain that are reasonable in the effort applied and remain plausible in a competitive world?
Depends on what is reasonable for you. My answer would be GNU/Linux phones, Librem 5 and Pinephone. Their development direction is not dictated by Google.