These other companies can manage it.

YouTube can't, but importantly YouTube wants it both ways - they want to include content that targets children without providing any of the protection that parents expect.

And that expectation isn't unreasonable. We don't want parents who helicopter every waking hour of their children's lives, we want to give parents some freedoms to allow their children to explore and grow.

But there's no reason to include youtube in that, just like you (presumably) don't include the broader internet in that.