This exactly.

But to be honest, maybe this is an opportunity to create some kind of maturity level standard, where content shouldn't be above a set threshold, regardless of source. On YouTube For Kids, it would be lower than regular YouTube, which would be lower than RedTube. Advertising would be compelled to build in functionality that checks a page's threshold and serves ads that match.

I'm not saying I agree with the idea, just putting it out there.