Malik Ducard, YouTube’s global head of family and learning, likes to tell a story about the time the YouTube Kids app clicked for him personally. It was just before the app’s official launch in 2015, ...

In early July, YouTube made a significant change to its software to boost what it deems “quality” children's content, sending waves of traffic to certain video producers and burying other channels.

Kids' entertainment is massive on YouTube, the internet video-sharing arm of Alphabet Inc.'s Google. It's also incredibly controversial. Because YouTube lets people post clips with few limitations, it ...