Goolag just hid the dislike count on the HTML side of youtube and the public api access is next, meaning only video creators can review downvotes.
Their claims of mental health are bullshit as this will only placate narcissists, and this only exists to allow questionable parties to hide bad reception of their videos.
And just like that YT will turn into Tumblr.
The reason why SJWism started out on Tumblr is exactly because of that, lack of negative feedback to inform both the content maker and consumers that said piece of content was low quality.