Yeah mine is a Youtube addict, with almost no control and we kept it like that because while it probably kills her attention, it made her English insane (we re both non native, Im French and my wife Chinese, our daughter speaks like an american while we live in Hong Kong), she knows things we couldnt possibly have taught her, and at 6yo she seems to be genuinely benefitting from it.
Ofc the most annoying is her addiction to toys marketed there, but when I was a kid it was the same with tv, you just need one colorful commercial to be a poisonnous little shit for months until "okay fine yes" is uttered at xmas or someth.