My guess is that people disagree with propagating the delusion that pasting that link in every comment helps with stopping AI from feeding on your input.
My speculation would be: GamerNexxus plays the YouTube game and uses clickbaity titles (sometimes? I don't know many of their videos). And it seems the host likes to hear himself talk (which would make sense, given that talking is his job).
However, some people don't like it and therefore downvote comments that welcome the channel.