Agreed its more of a PvP thing, but not unheard of in PvE.
I cannot speak for everyone who does this, but as someone who does “Viewer RBGs” while I’m streaming I can talk a little about it.
But first, I tiny bit of background. I’m not a big time streamer. When I go live for my guild raids I get maybe 3 viewers, when I do RBGs its closer to 10 because I do advertise my stream in group finder. But I don’t require people to talk in chat or follow my channel to be invited to the group, as some streamers do.
My reason for listing my stream is because it is a way to grow my channel, to just let people know “hey, i’m doing this, if you want to swing by and say hi, please do” But, I also don’t promote myself as a booster. I look for people at my similar CR and make a group to increase my own rating, so there is a difference there.
As for if it should be allowed, thats an interesting question. Any boosting service requires some sort of transaction / interaction. You have to pay X amount to hit Y rating, or kill Z number of bosses, etc.
With twitch advertising, the interaction is asking people to go to your channel, type a few words and click a follow button. No gold or cash has been exchanged.
Lets look at the actual quote:
The key here, IMO, is organizations.
The group finder is an in-game tool, and streamers are individuals, not organizations.
So, in my opinion, this does not restrict streamers from advertising their twitch channels, whether they are boosting people or gaining rating with them.