On 6 April, Maryland became the first state in the US to pass a “Kids Code” bill, which aims to prevent tech companies from collecting predatory data from children and using design features that could cause them harm. Vermont’s legislature held its final hearing before a full vote on its Kids Code bill on 11 April. The measures are the latest in a salvo of proposed policies that, in the absence of federal rules, have made state capitols a major battlefield in the war between parents and child ad...