@GrapheneOS
Yes! GrapheneOS is great! The Team behind it too... But it is good to mention, that it is AOSP based... And AOSP code is not just 15 people work.
Simmilar to OxygenOS or NothingOS. It is more like distribution than the separate OS. Realy good, polished and hardened distribution of Android.
GrapheneOS, OnePlus or Nothing are still havy based on AOSP and the changes/patches that are for all Android OS'es and that are not a result of only 15 people work.
P. S. I apriciate your work!