GrapheneOS officially recommends Sandboxed Google Play instead. Many FOSS Android apps are also in Google's Play Store but sometimes they are not (like NewPipe). In those cases, you can keep up with updates using RSS.
DivestOS doesn't recommend Google services. Which approach is the best for privacy? 'microG is NOT supported and NOT recommended, however it can work in an unprivileged fashion on DivestOS 17.1 and higher after the July 2023 update. Note: microG on DivestOS is only visible to other apps in the same profile as itself.'