The problem is that you think it optimizes for one thing, while in reality it optimizes for an entirely different thing.
What exactly do you mean? I just want it to learn my behaviour to show me relevant stuff. But it seems it just takes the last thing I was interested and then shows me 80% of that stuff. I immediately click “don’t recommend channel” when the title says “scary truth” or shit like that, but somehow it is too stupid to realise that…