Not all reaction channels are made the same. Some channels have at least interesting themes, like a classical music teacher who had never actually payed attention to rock, reacting to rock music classics. She is literally learning as she goes, and does some amazing and deep musical analysis of popular music, and you get to share her journey learning about the history of rock and the myriad of sub-genres, giving genuine appreciation to a genre I love.

Some streamers do movie reacts with Amazon Prime promotional tie-ins, so it's like sharing the couch with a group of comedians. If you already know the movie it enhances the experience with commentary and jokes.

Now, the particular brand of watching other YouTube channels, making dumb comments about them, stirring shit, causing drama and then doxxing other YouTubers. That whole scene is straight up trash and content theft.