> Calyx also has a great built in Firewall app to cut off apps from the internet

Datura Firewall is a fancy frontend for the leaky LineageOS network toggles. They don't block indirect network access like the GrapheneOS network permission toggles. Can be bypassed by apps using DownloadManager. It also has other features it claims to provide which it can't.

We could have an endless debate about theoretical hardware backdors, but what I wrote above can be proven. 

 thanks for writing in.  can i get the proof link?