I believe that short form video coupled with infinite scroll mesmerizes humans. It keeps them in a trance by using suspense. The brain absolutely must know how the video plays out whether that be waiting for the punchline, a fight to break our or a fact to be delivered. Once the brain has locked eyes on the video the user must put significant energy into making a conscious decision to look away.
Even OpenAI's latest Sora app leans into this format and the videos there are literally the poorest quality on the Internet. 99.999% of them are eight seconds of unintelligent, unintelligible, low grade digitally created excrement.
There should be a law against it.
Big Tech knows this. They have teams of people with doctorates making apps engaging.