Not only did Alexa retrieve the wrong content (instead of a list of challenges to do, Alexa sourced from a list of dangerous challenges you shouldn't do), Alexa then stripped off the entire context of the warning about not doing the challenge because it was dangerous, and instead added a timer.
So the issue here is less about needing to sanitize the internet for kids, and more about how AI struggles to categorize and summarize content and the dangerous effects that can have.