“You don’t even have to look for it,” nine-year-old Anaqi said of the short videos he watches online. “It just shows up automatically, and it’s super interesting.” That instinctive pull is familiar to his father, Firdaus Omar. The 39-year-old Malaysian civil servant said his two children – Anaqi and his six-year-old brother – could spend hours watching the kind of short, noisy, endlessly recommended clips now commonly dismissed online as “brain rot”. He is worried about the effect of such...