Parasitism on content, welcome to RU-vid. The only benefit they can possibly bring is when big reaction channels may play its role in popularisation of a certain movie/title - but only if the source is good, otherwise they're just pushing garbage into mainstream.
I read the Manga years ago during its weekly releases. I will say seeing people's reactions to what's going on is hilarious especially since they did not read the Manga. Also the story is slightly changed... seeing a mega reaction is interesting rather than looking at them individually
Yeah I don't have anything personal againts them but they really are failing big time as a reaction channel. Even when a fight happens it's just them uninteligibly screaming like 5 year olds.
They haven't been good or interesting in a long time imo. All they do is sit there uninterested until action starts so they can yelling out their catchphrases