In what regard? That they have no right of privacy? That people around them (teachers, other parents, ...) have no reasonable expectation of not being monitored? Should I now treat every four-year old as a walking covert listening device? That six-year olds cannot be trusted to obey rules and recognize limits? And if the kid is so young it should absolutely not be on it’s own, then parents should be around and there’s no need for a monitoring device.