I have my browser set to clear cookies and site data automatically, so I'm not sure if my experience of YouTube shorts is typical, but I have a pet theory about why the feelings you describe are so common. It seems like a big part of the addictiveness is
not that the content is eye-catching, although this clearly has an effect. The platform gives you a quick way to move onto something else by scrolling/swiping, which means I find myself caught in a cycle of:
1. seeing AI slop or a unoriginal 'comedy' sketch,
2. thinking "eww get this off my screen",
3. scrolling down to the next video; jump to step 1
On the rare occasions that the algorithm does show something genuinely interesting or creative, I watch to the end of the video and feel a lot more satisfied about spending time on it. That's not to say that long-form videos can't be distracting and addictive, but I would posit that 'shorts' engagement is actually driven by disgust rather than curiosity. I now avoid YouTube shorts like the plague, because life is too short to experience that volume of disgust in it.