I'm not sure those are comparable. If you remove ninja and shroud, you're left with ~infinity-2 people playing FPS games on twitch. Removing a high quality electronics repair channel on YouTube is a significant impact on that class of content.

I'm going away from YouTube to twitch and other services for some specific tech content. If it's relatively unique, people will find it. (Or if you build awareness over a long time, rather than starting on the day of disappearance)