Since LineageOS leadership seems to be mostly concerned with good Google relations they are interested in getting people to dl the Gplay apk and install it; LineageOS for microG is a minor fork with the major benefit of being designed from install to spoof Gplay services and never installing Gplay so be sure to follow and get the correct OS for your privacy.
https://lineage.microg.org
The fork of LineageOS from the microG project
https://microg.org/
Paid Protonmail has a google compatible calendar which is supposed to go free this year sometime, I have not tried this with my N900, you can get the email app APK or if paid use encrypted pop3.
Lineageos with microG includes fdroid store with most apps you will need.
If you are not concerned with tight security Aurora store app lets you get annon APKs direct from the Google store that you can't live without.
MicroG spoofs location and most other(excluding push) Gplay functions.
this link can also help shine up LineageOS
https://old.reddit.com/r/privacy/com...ageos_in_2019/
LineageOS with microG is still just an Android fork and you are still stuck with super sketchy hardware and bin-blob drivers which seem designed to serve governments and corporations not you. This is why I (recoverably)neutered that Android phone's cellular capability after putting the best in a bad situation OS onto it.
There are the root level ad blocking, VPN, script blocking, and other things you can do to get the best and most you respecting experience out of the hardware we have to work with.
Hoping that the next GNU Linux handheld is finally a true user device with proper hardware/drivers and a large enough ecosystem of programs and perhaps wine-like containers and compatibility to bridge the gaps of things we need in a mobile comm and computing device.