FAQ 050. Why use Signal messenger app for communication?

Many top security experts have concluded and agree that Signal messages and calls are private. The Signal app is open-source code and has been analysed by experts.
Note:-
If a computing device is compromised another way (eg back door through SIM, running a proprietary OS like Android, Windows, macOS) then no private app can be private.
To even start to be private, we must abandon big tech operating systems completely. Get a deGoogled phone and a Linux laptop/desktop.
We are wasting our time discussing the privacy and security of apps if we have not sorted out our operating systems. An operating system (OS) is the foundation on which apps are installed.