I'm not sure I fully understand this.
Why are GrapheneOS releases dependant on Google releases?
They are dependent on the AOSP releases (which Google develops) and on the manufacturer updates (and because GrapheneOS runs on Pixels, then it goes back to Google again).
alt Hacker News
They are dependent on the AOSP releases (which Google develops) and on the manufacturer updates (and because GrapheneOS runs on Pixels, then it goes back to Google again).