I sometimes look for obscure how-to's, and I get garbage videos not even answering the question. If YouTube can get rid of all that garbage, then not having a dislike button is fine.
The problem with Youtube as I see it is that these comments never rise to the top. It's always compliments and ass-kissing and high-fives that make it there.
Twitter tends to gravitate towards the opposite.
It's all fascinating though.
That's because they have engineered their comment system in a way that comments the AI perceives as negative are shadow-banned or buried deep down so people don't get a chance to read them.
In the 90's there was an add-on that allowed anyone to comment on any webpage: http://alumni.media.mit.edu/~orit/utok.html
Although imagine having such a tool nowadays and opening cnn.com, it'd be like walking into a MAGA rally.