Anger does drive up engagement, but the point of engagement farming is supposed to be so that you keep coming back to the content (YT videos, articles, whatever) and therefore it gets more exposure so that the attached ads get more exposure.

The ads themselves designed to make you angry at them doesn’t seem to make sense, at least as a default practice. There’s really only hyperspecific niche scenarios where the ad itself making you angry at the ad is beneficial to the people paying for it.