As long as Google allows installation of apps outside the play store this will not happen. Moreover Google devices are the most open modern mobile devices out

As long as Google allows installation of apps outside the play store this will not happen. Moreover Google devices are the most open modern mobile devices out there now (I am intentionally excluding Librem5 and Pinephone). That is because on a Pixel you are allowed to relock the bootloader and load an image that you self signed!! This has spawned a niche ecosystem of android forks on pixel devices (look for RattlesnakeOS, GrapheneOS, CalyxOS).