The danger of short form videos is because the form enables the algorithm designer to artificially maximize the reward with minimum effort by the viewer. It doesn't matter whether you watch kitten ones initially. After watching it for a month casually, chances are you would end up watching some addictive videos for hours with little effort. It could be some endless stream of Buddhist monks talking about suffering, if someone likes that kind of thing. It's just designed to be addictive with crazy high reward/effort ratio.