Multiplayer games and privacy

So I've been playing a lot of WoW lately and that includes a ton of raids, always with voice chat on discord. Just now I found out that someone is a streamer and broadcast a full raid + the voice chat.

I was not part of this particular raid thankfully. And as far as I can tell he doesn't have a lot if any viewers. But it still made me uncomfortable that someone has been streaming my voice without my consent, without my knowledge even. I do not feel that it is unreasonable of me to expect someone to ask for permission before doing this, but maybe I am just completely out of the loop about streaming?

Is it naive to expect privacy in this regard? Is this what one should expect from online gaming nowadays?