For those who have not read it, this post is an interesting analysis of exactly how Discord takes your data: https:spyware.neocities.org/articles/discord.html
Now, I've already brought my close friends over to Matrix, but I've found it doesn't really have a substitute for Discord's voice channels. Is there any good and free substitute for that? Some kind of voice chat people can easily jump in and out of? I know about Mumble and rocket.chat, but they're self hosted and I currently dont have access to a server, and Mumble doesn't have a fancy mobile app I can tell my friends to install.