I do agree with you that these reaction channels are treating copyrighted materials badly, and that a lot of them are blatant copyright infringement. But to be fair, the youtuber who infringed on your work is actually usually legally obligated to remove the infringing content. So complaining that you're not making money off of a copyright infringement is the same argument that media companies had over The Pirate Bay. And we all laughed about that, because it makes no sense whatsoever.
Also, you can't quantify the lost views angle.
I do agree with you that these reaction channels are treating copyrighted materials badly, and that a lot of them are blatant copyright infringement. But to be fair, the youtuber who infringed on your work is actually usually legally obligated to remove the infringing content. So complaining that you're not making money off of a copyright infringement is the same argument that media companies had over The Pirate Bay. And we all laughed about that, because it makes no sense whatsoever.