There are basically 2 types of react streamers
One of them actually react to something, introduce their own thoughts and opinions, and maybe add in some missed information or data, all in another video separate from what they are reacting to.
The other is "react" streamers, aka watch the entire fucking video on Youtube or Twitch and go "haha" or "oh no" once in a while
Pippa is the former, Ironmouse is the latter.