Comment by ysnp

The details of the partnership are mostly disclosed in the joint announcements but GrapheneOS has no say or influence on Motorola's stock Android image and policy.

The main objective of the partnership is to do what you described in the former case, get Motorola up to a standard where GraphenOS could support the phone. They could not previously take a Motorola phone and build GrapheneOS for it because of numerous basic requirements they did not yet meet. I can guess that GrapheneOS only really condone the efforts Motorola will put in to meet their support requirements as a platform.

Motorola also gets to incorporate a subset of GrapheneOS's features and improvements as enterprise targeted Motorola features. GrapheneOS do not have any direct influence over the apps and policies for the stock GMS Android image Motorola ship with their phones. Motorola have no significant say in what GrapheneOS does with their OS. GrapheneOS can assist Motorola in hardening efforts at the OS and firmware layer etc.