Anika Wells says teachers can still use YouTube for educational purposes:

One of the reasons why that has been done (restricting who can hold a YouTube account) is to allow teachers in classrooms, if they want to show a YouTube video or what have you, or parents for that matter, something that is educational, we recognise that many of these – social media is not all bad. We aren’t saying that. We want to make sure that we restrict the harmful content.