Well Discord has become more than just Vent server alternative, people use it for more than just game chat. There’s a lot of local communities that have discord servers and use them to organize events and chat, and so you end up knowing a bunch of people through discord. Alternatives can be difficult in that circumstance. Like sure you can get their phone numbers or whatever if you know them well enough, maybe start a group text, but it doesn’t necessarily equate. If you run a server I can see it being wildly difficult to move a whole community off of Discord and getting people to use an alternative platform. Personally I’m all for moving to Matrix if I can convince my D&D group, but those local communities, the only option is to basically to drop out of them and lose connections.