It’s a challenge to account for active usage at the router. More likely than not, you end up over counting usage and annoy the child, which might lead to disputes.
Our general advice is, instead of monitoring a child’s every move, parents should spend more time communicating and building trust. Technology can only play a secondary role. Our initial motivation for building this product was to make parental control less restrictive, not more. We wanted to build something parents love, but children don’t hate.