Idk why you're being downvoted since everything you said was right.
I think it just got popular because younger gamers don't know how to use computers, and Discord was easier to use than everything else. The client also looks much nicer than mumble, and overall has better on boarding. The mumble homepage for example looks like a developer site.
How is election security in Canada? There was fuckery in the last presidential election here, and I don't doubt they'll try it in Canada too.