The mobile landscape presents a very difficult choice. Choose Android, get actual access to your device and install what you want but have your privacy completely trampled upon by Google Choose Apple, get marginally better privacy but no ownership of your phone and no possibility to install what you want. I wish we had a reasonable alternative, it's so frustrating to have to choose between two bad alternatives and th…
It's highly likely that even if there's an commercial alternative which gains significant market share to compete with duopoly in the future, they will have to do so by either compromising privacy or ownership of the device.
Solution right now is to make difficult lifestyle choice by using passion or idealistic projects. LineageOS + Fdroid can get things done for those who use their smartphone as an tool and ready to sacrifice a bit of social conformity(which can be a privilege at current times).
There are more extreme alternatives like Linux phones which I hope becomes less extreme in years to come.