CalyxOS & LineageOS they both share the same issue and they both always use multiple Google services too while giving them privileged access even if users don't use microG. It would be wrong to imply they don't use Google services. microG is of course an implementation of Google services. GrapheneOS doesn't use Google services by default.

To clarify further they always use Google services even without microG. They use Google for connectivity checks, network time, attestation key provisioning, SUPL, DNS fallback (LineageOS only), PSDS (Pixel 6 and 7), eSIM activation and more enabled by default.