YouTube's Removal Of The Dislike Button - YouTube Dislike Button meme

Nah, I don't believe they really care about it all that much, otherwise they would have implemented it back then and not three years later.

No, it's probably to protect their corporate overlords in situations like when Disney or WB or EA put out a trailer for another pile of garbage that people would want to mass downvote.

It's when they first started planning this feature.