I'm going to preface this with I acknowledge that this is a private server and that in itself already violates the Blizzard Terms of Service ect.
But, encouraging others to stream themselves playing a private server on Twitch/Youtube or whatever doesn't seem very smart. I know that a lot of streamers and just regular people play private servers myself included but they and myself would never stream it. It's a good way to get banned from Twitch and if you
re an affiliate/partner a good way to lose your status as that. I'd love to stream Wrath content and I'm sure my viewers would too but I'd rather not get banned/lose affiliate over something so trivial.
So, maybe don't advertise streaming on Twitch? Clips/videos from Youtube seems pretty grey area even if its also against their TOS.