In the past, these self-media writers always had references to look to.
For example, if Lu Ban's film grossed high at the box office, there would naturally be a basic opinion formed: Lu Ban made a good movie.
If the box office is high, the movie must be good—no problem there.
Of course, from here, a contrary opinion could also derive: unmerited success, the movie isn't good, it's just the timing and various external factors that led to high box office sales.
With opposition, there's discussion; with discussion, there's heat; with heat, there's high readership; with high readership, there's high traffic; and with high traffic, there's money to be made.
In short, the job of self-media is to put forth opinions.
Whether it's good or bad doesn't matter; in any case, it must polarize, it must create opposition, and it absolutely cannot be moderate.