YouTube video recommendations, which converge on recommending conspiracy theories and shocking videos to easily manipulated people, especially children.

I am not worried about literal paperclip maximizers, but this may be the closest real thing to that parable. The hypothesis isn't that YouTube's recommender system didn't work -- it's that it worked too well at its assigned task of maximizing view time, and we humans are finally realizing that maximizing view time was not what we actually wanted.