Youtube has made the decision to remove the number of "dislikes" on all YouTube videos on all platforms, whether watching YouTube videos on the desktop computer platform or on the mobile platform.
Elimination of the number of "dislikes" on all youtube videos, because they want to avoid harassment or threats from so-called "dislike attacks", from people or groups who want to take down the video.
Even though the number of "dislikes" is not displayed on the video, but YouTube still displays the icon, users can still press the "dislike" button, to show their dislike of the video.
Youtube video owners can still see the number of "dislikes", for analysis purposes so that the creation of video content is more interesting and better.
The policy change regarding the number of "dislikes" is, because YouTube has made an experiment: whether this kind of change can reduce "dislike" attacks and harassment against content video creators.
The result of the experiment is that the amount of public disapproval can affect a content creator's "mental health". However, "dislikes" can also serve as a signal to content creators when their videos contain clickbait, spam, or misleading videos.
Youtube Removing Dislikes