Every parent knows the fight over the phone.

Almost none of them know the fight was decided before it started.

A child begins with a video. The video ends, but the session does not. Autoplay supplies another. Recommendations drift. Platforms use signals like watch time, repetition, device type, time of day and content choices to predict what happens next. They may not know exactly who is holding the phone. They know enough to shape what happens next.

Kids All the Way Down: How Platforms Engineer Engagement examines what happens when those same signals suggest a child may be present. Engagement remains automatic, while protection often requires a parent to intervene. What responsibility looks like once the risk is foreseeable and the means to reduce it already exist?

From the family room to platform design, child-safety law, schools, advertisers and regulators, Kids All the Way Down asks where responsibility belongs, and what would change if uncertainty finally had consequences.