YouTube comment sections are weirdly positive always. It could be a video of some horrible crime and the comments will be about how great the channel is and encouraging the channel to keep making more videos. When j visit actual fan pages anywhere else online there are always a mix of opinions. But youtube is constantly full of obsequious people
Negative comments are purged. I think a lot is done automatically with semantic analysis, but the owners can also delete things. This is why you hear about YouTube comments being a cesspool in the videos, but when you look it’s all bland praise agreeing with whatever brain dead position the video took. They have to read them to delete them.