alt Hacker News> getting everyone to spontaneously switch with no clear benefit hasn't worked
Somehow Discord pulled it off. It really didn't have much of an edge over the other chat apps at launch, just was slightly easier to use because it was simpler. A new site launching now could easily have that over Discord.
You're ignoring the massive edge it had over TeamSpeak and Mumble. Back when Discord was launched, it was significantly better than its competitors and the cherry on top was that you didn't have to install anything or host your own server, just make an account.