Some people can have a fatigue where they're tired of just moving platform to platform. Communicating platforms is heavily saturated to where, nobody would feel that grand of a difference going from Discord to that platform when they can still do the basics. People still wouldn't leave Facebook, even, despite that platform having largely corroded over the years.

Until Discord is like charging people to use it, people aren't going to budge. In a world where your privacy is circumvented whether you know it or not, a lot of people just shrug their shoulders at you when you present alternatives all like "ehh, cool" before just resuming what they're already using.