Well it's open source. And you can use AOSP, or LineageOS, or CalyxOS, or /e/OS. I used /e/OS before moving to GrapheneOS (when I changed phone), and /e/OS run

Well it's open source. And you can use AOSP, or LineageOS, or CalyxOS, or /e/OS. I used /e/OS before moving to GrapheneOS (when I changed phone), and /e/OS runs on tons of devices, but they just don't get full updates. So you end up running with a device that hasn't received vendor security updates for years, which is worse than just using Stock Android. At least GrapheneOS does not support many devices (for good reasons), but the ones they support, they support really well.