I remember having a playful argument with my wife and her siblings. They were tiktok users (not obsessed but they did watch _a lot_). They said it was good because it gave you interesting stuff based off of your algorithm. I took the phone and held it up saying "ok, let's see what's interesting." We went through 10 clips before something moderately interesting came up. That's been my experience watching too. You get 10 useless things before 1 potentially interesting piece of content shows up. Not to mention blatant ads, misinformation and downright lies. (I saw someone who must have been 19 giving "tax advice" that was just incorrect)
Now, lots of people point to boomers being couch potatoes themselves... but it's nothing like sitting down moving your thumb around to find a few seconds of dopamine between nonsense... and people will do that for _hours_ not minutes.