DC Phone Home
That is a huge rise in malware - wow! GG Discord, not.
I've hosted my own Mumble/TS3 for donkey's years.
Earlier this year I left a community, or rather they left TS3, when they decided to go Discord (cos kewl). I told them I wouldn't follow and explained why (service not in 'our' control = not secure or guaranteed resilient etc. My work doesn't make an extra attack surface sensible). Of course I was scoffed at. So a gaming community of ~40 members, some of which are RL friends and I've played with for many years, upped and went.
My first thought on starting to read the article: credential theft for the purpose of gold selling.
Discord doesn't just phone home, you're in its house all the time. What could possibly go wrong?