Ham-fisted is right. This is going to kill family vloggers, or even just vloggers who happen to have a family in the background. YouTube is a lot less engaging when you don’t feel like you can interact with the creators or other viewers. I know everyone trots our the “YouTube comments are a toxic cesspool and provide no value” trope, but almost every video I watch on YT 1) has a kid in it somewhere, 2) has worthwhile and positive comments.
It’s like the joke about nuking your house from orbit because you saw a spider. Personally I’m far more concerned about the creepy videos aimed at kids than I am about pedos leaving hobo signs in the comments. As another commenter said, they’ll just move to a separate site to link to videos. You can’t stop them from watching videos and sharing them with other people unless you shut the site down completely.