I'm not a GrapheneOS user (yet). However, as I understand it GrapheneOS does not obligate the installation of "Google Play Services" but does permit the installation of the service in a sandboxed environment (or separate profile).
As I understood, they will roll this out through "Google Play Services" and not the Android OS. So, any device with Google Play Services will be affected.
I'm not a GrapheneOS user (yet). However, as I understand it GrapheneOS does not obligate the installation of "Google Play Services" but does permit the installation of the service in a sandboxed environment (or separate profile).