[Teknoman117]

I'm fairly certain that this is the default behavior of WebRTC SFUs? (all that I've seen at least) (SFU = Selective Forwarding Unit)

Unless Discord claimed they were P2P encrypted this shouldn't be a witch hunt. It's the default behavior for most WebRTC systems.

The clients establish (encrypted) connections to the SFU(s). The SFU then reads incoming data and forwards it to whichever other clients are supposed to be receiving it. However, they maintain state per client and possibly do things like transcoding audio and video if the receiving client can't handle the source quality.