[not_your_vase]

  Quick google:
  Number of discord users: 150M
  Number of matrix users:   60M

Go where you can reach the most people. Not saying I like it. It's just the way it is.

[gchaincl]

I didn't know matrix had that many users! Despite of that, I still believe that the ethos is important, I tend to think that people choose the open source model for a variety of reasons, including principles.