Google routinely adds privacy features to Android and many of the GrapheneOS privacy features are inherited from or expanded upon Android. It doesn't matter to

Google routinely adds privacy features to Android and many of the GrapheneOS privacy features are inherited from or expanded upon Android. It doesn't matter to Google because they can still grant themselves any permissions they want by default on stock GMS Android ROMs, while limiting access to third party apps. (Most people don't know/care that you can deny certain permissions from certain system apps including GMS even on stock Android and this behavior isn't guaranteed anyway.) Contact Scopes is GrapheneOS exclusive for now but it's not unlikely that Google would add something like that, especially now that iOS has it. They have accepted several security patches from GrapheneOS already.