I actually witness this fairly regularly. The eldest has a phone (but only allowed to use it for an hour on weekends). He immediately becomes snappy, moody and basically is just a cunt of a kid as soon as he gets sucked into the brainless shit that youtube pushes on him, whereas he has never acted that way when it came to any video game. Sure he'll complain a bit about wanting to play more, but whether that's a video game or playing football with his friends he'd be complaining anyways, and I'm sure every single child in the history of humanity has complained about not being able to play for longer. Ripping the reels away though? It genuinely feels a lot more insidious to me the effect they have on his mental wellbeing, it turns him into an actual thoughtless zombie for a while as soon as he lays his eyes on them.
And this is coming from the Uncle that was obsessed with video games when I was his age (and I still am!), I'm very happy I didn't have anything like tiktok when I was growing up and was forced to dig holes in the dirt and throw marbles at my friends instead to get my entertainment.