My experience with YouTube seems to be entirely dissimilar with the clickbait/algorithm horror stories I'm reading here in the comments. I watch a lot of Youtube and I let my 1st grader watch YouTube somewhat unregulated. It's seems entirely fine to me. When I do look over his viewing history, I'm relieved it's all fairly wholesome content. No, he's not always learning science and math (but sometimes), but I simply do not consider his research into "what every color light saber means" as harmful. Looking over my own current recommendations it's all science and engineering related videos because that's what it knows I'm interested it. You get out what you put in.