Oldest goes down rabbit hole of topics of interest - benign useless filler stuff, e.g. mostly pro sports commentary, random things like Disney ride trivia, and other random pop-culture filler. If left unchecked, i wouldn’t be surprised if they spent 8+ hours on YouTube. If moderated, YouTube gives them a fair amount of stuff to talk and connect with others about in real life. Overall impact: neutral to slightly positive if moderated to <1h/day. Food/drink equivalent: Honey Mustard and Onion Pretzel pieces (a few are great, but then you can’t stop and you end up eating 1500 calories and everything tastes wrong for 24h)
Younger teen: will consume insane amounts of gaming videos, most of the creators border on toxic personalities. We’ve banned a number of channels for them, but they find other shitty personalities. I can’t stand the content they consume, but I chalk a fair bit of that to my ignorance about teen culture and mostly grit my teeth. Covid was the worst. I hate YouTube because of their content choices. However, it does provide a small basis of connection to their group of friends. [edit: I also stupidly made a deal that w/ straight A’s I won’t be overly restrictive, which they’ve upheld, sigh] Overall impact: toxic to the point where every month or two I’m convinced to ban YouTube across every device in the house. Food/drink equivalent: Natty Light that’s barely chilled.
Pre-teen: by choice, they spend ~3/4 of their YouTube time learning new skills or facts. Mostly learning specific techniques in the iPad app Procreate, acrylic painting (irl), a ton of educational videos about wildlife/animals they love, etc. But more significantly, their YouTube use has created the reflex to “search first” whenever facing a knowledge/skill gap, then ask for help. They’re the only reason i don’t straight up block YouTube at the network level, for all devices. Overall impact: very positive. Food/drink equivalent: natto and rice.