There's really a wide range between "not looking after kids" and "watching them every second." Unlike the physical world, digital items allow kids to transition from a totally safe space to an unsafe space within seconds.

For example, I can have my kid do whatever he wants in his room. I know what's in there and while he may have the occasional stupid idea, it's all fundamentally safe.

But even a tablet breaks that barrier. It's entirely safe for him to listen to music and stories and I want him to be able to do that unsupervised. But solid control over content on Spotify isn't a thing. The catalog contains things that I consider not appropriate for him. And they've lately been adding vidoes to the feed and while I know he tries hard to resist, they deliberately push videos further and further up. So we're back to "I can turn on the story for you and you can listen.", which is super stupid and could be much better if I had solid controls that I can trust.

Yes, I know I can talk to him about not watching the videos. How can an 8 year old compete with the combined effort of the Spotify team paid to make him watch videos? That's just not feasible.