They would have to use these manually, though. The game isn't going to know they are streaming. So it's no real difference than telling the party you're streaming now.

I'm in the camp that if we are uncomfortable on someone's stream, ask if someone is streaming and leave if you aren't okay with that. There shouldn't be any judgment if someone does leave. They aren't okay with being on someone's stream and that's perfectly acceptable. But I think with so many streamers out there and so many that are small, this is a bit of personal responsibility we all need to take to keep our environment comfortable for us.