This is why open source for communication platforms is so important.
Discord WILL disappear at some point and millions of people will lose their communities.
Discord WILL disappear at some point and millions of people will lose their communities.
Online communities can rebuild quickly are more resilient in a sense e.g. Digg to Reddit migration.
I can try to think of a simple scenario. For whatever reason, a user may not be as active in the new platform as they were on discord. This could alter the community dynamics. On a bigger scale this could have visible effects in the actual community.
To be clear, I am not advocating in favor of staying on discord. I just find the concept of community building interesting.