I don't think it's any worse than any other form of media (like reading comments on hacker news instead of reading the article)
Videos cram so much stimulation over such a short period of time
Text you still have to read
Hypothesis: video is more addiction, regardless of content
I frequently give up on reading a thread midway down the page because it's requiring *too much focus*, and, get this, I might even interrupt my break and just go back to work early instead!
I don't think that would ever happen on a neverending infinite scroll of hyperengaging video.