They are not very useful as they are only available in some sections of the site, and not others, for some reason.

I have used the "Not interested" option some 200 times and YouTube still keep recommending to me stuff that is trending and I have no interest in.

The modus operandi of these modern AI-based recommendation engines is basically "shut up, we know better".

I don't feel like working for a dumb machine I don't understand and probably doesn't care about me.