Is not most of android open-source enough to fork? Sure you'd lose all the google integration and the binary blobs of the play store, but if you were 'going alo

Is not most of android open-source enough to fork? Sure you'd lose all the google integration and the binary blobs of the play store, but if you were 'going alone' you'd not care that much about the play store anyway as you'd diverge from android prime over time.