YouTube bans kids from live-streaming video unless accompanied by an adult following NYT report about YouTube's recommendation algorithm for posted videos

Responsibility is our number one priority, and chief among our areas of focus is protecting minors and families. Over the years, we’ve heavily invested in a number of technologies and efforts to protect young people on our platform, such as our CSAI Match technology. And in 2015, because YouTube has never been for kids under 13, we created YouTube Kids as a way for kids to be able to safely explore their interests and for parents to have more control. Accounts belonging to people under 13 are terminated when discovered. In fact, we terminate thousands of accounts per week as part of this process.

We also enforce a strong set of policies to protect minors on our platform, including those that prohibit exploiting minors, encouraging dangerous or inappropriate behaviors, and aggregating videos of minors in potentially exploitative ways. In the first quarter of 2019 alone, we removed more than 800,000 videos for violations of our child safety policies, the majority of these before they had ten views.

Source YouTube.com