It's mostly frustrating to me, because I've gone back to look for a video to see what a product was called, but it's not in the title so I can't ctrl+f and look for it (youtube's search sucks). So I have to scroll through the videos, find a video that might be about the thing that I want to look at, then click it it, check to make sure it is the video that I want, then go to the description.
That's dumb and a waste of my time.
I can forgive baity thumbnails, as I never have to think about it again after I click on it, but not being able to ctrl+f on their video page is super annoying.