This is a no brainer when you think about it because only Affiliates and Partners can even get subscribers in the first place.
How do you make a clip on Twitch? It mentions several tricks which can help one to watch private videos on YouTube without getting any permission.
What's the best mic for a private stream on Twitch? Select the menu in the top left corner, expand Settings and click Channel to view your settings.
Even when your profile is private, you can still send and receive friend invites within the Steam social system and even trade items.
I do love when people share videos over Drive — feels just like YouTube.
Click on it and choose the private option as shown below.