I'm running matrix with jitsi for voice. No one is gonna leave discord for it though....not yet in my circles at least.
I know of nobody who even knows of Matrix, if I haven't told them beforehand. Discord is so much better than all alternatives, that I just don't see why anyone would leave it.
if people actually cared about freedom/privacy, Discord wouldn't be a thing, right?
and even harder to leave Discord now when a lot of users invested in Nitro fancy emoticons and profile enchantments