Telegram and signal are both central points of failure. Signal can be used with other servers, but the server address is hard coded in the app, so you have to deploy your own app. Matrix servers can keep a channel going even if the channel’s home server goes down. The more home servers there are, the more mirrors of public channels there will be.

Easiest way to get going: https://github.com/spantaleev/matrix-docker-ansible-deploy

I love gdb! I recently had to do a debug and wow its so cool! On gentoo I can compile everything with symbols and source and can do a complete stack trace.