Purism's Librem runs GNU/Linux, not Android; microG is a free replacement for Google bits in Android (Google "services", including location services from other

Purism's Librem runs GNU/Linux, not Android; microG is a free replacement for Google bits in Android (Google "services", including location services from other sources); LineageOS is a non-privacy focussed, somewhat de-Googled Android; /e/ is a privacy and free software focussed derivative of LineageOS with a larger set of supported hardware; GrapheneOS is a security-focussed (not privacy-focussed) version of Android with rather limited hardware support. It's not clear to me what the fundamental difference is between CalyxOS and /e/ other than hardware support and what's built-in.