I’m glad my kid hasn’t stumbled into that side of YouTube. It’s part of the reason I don’t want to install YouTube kids. I know the same content is on the main app, but it’s just there on YTKids
I personally love YouTube and I’d sympathize with your nephew, except I binge on 15-minute-explainers. That shits my lifeblood.
At least the channels he watches are usually well narrated.