I discovered so many wonderful documentaries thanks to youtube, some about things I had never heard of before. "It’s in YouTube’s interest to keep us watching f

I discovered so many wonderful documentaries thanks to youtube, some about things I had never heard of before. "It’s in YouTube’s interest to keep us watching for as long as possible", and the way youtube keeps me watching as long as possible is to recommend stuff that I want to watch. I don't understand the problem with this metric. Is it that some people watch things they don't really want to see, like a trainwreck? But why do these people who compulsively watch things that they don't really want to watch keep checking youtube at all? Why don't they hit the dislike button? Wouldn't that adjust the algorithm?