Comment by LeifCarrotson

Read "Supernormal Stimuli" by Barret [1] for an exploration of the psychology of this "mesmerizing" effect - at least in general, if not specifically in short-form video and infinite scroll.

Whether the artificial stimulus comes in the form of junk food, entertainment, social connection, sex, we've seen time and time again that trillion-dollar megacorps employing thousands of the greatest minds of our generation have been able to invent substitutes that are more compelling than evolution has prepared the human brain to be able to deal with.

It does seem like video shorts are especially easy to exploit.

[1]: https://www.harvard.com/book/9780393068481