This is not an issue of what Distro Valve chose to use (SteamOS used Debian now it uses Arch) but is on Canonical for how they package it. I have just been dipping my toes into Linux lately and have been using Manjaro and Nobara and they have been working great for gaming and every day use… Until I play a game like Finals and have to swap to windows.
Videolabs is what was created instead of trying to make Videolan closed source or for profit. The founder of Videolan is the founder of Videolabs. Fully intentional.
Discord uses a framework called Electron. It uses, among other things, chromium to run the website on your desktop. https://en.m.wikipedia.org/wiki/Electron_(software_framework)
Steam at least uses chromium in its program for things like the store and built-in browser.
The bottom panel correctly have what they meant.