More in depth information about why microG is not recommended:
microG (UnifiedNLP) has an insecure implementation of which has had severe security vulnerabilities including leaking location data to apps which should not be able to access it due to restrictions. They fixed some but not all of it. It used to not enforce foreground-only, etc.
microG also downloads and runs Google Play binaries with special privileges. Claiming that the microG open source is open source and our compatibility layer approach is not is simply inaccurate. Techlore forum and community are incredibly toxic and not a reliable source of info.
More in depth information about why microG is not recommended:
Sources:
https://nitter.net/GrapheneOS/status/1705359329983951239#m
https://nitter.net/GrapheneOS/status/1705356173812142114#m