I don't think parents, most of who have a job and don't keep their kids under surveillance 24/7, can hope to compete with dozens of corporations with whole teams dedicated to making their platform addictive. I view the parental responsibility in the same way I view carbon footprints: a way to shift blame from corporations to individuals. I think this view also leads to individual-focused solutions that surveil people (age checks, etc) rather than systemic ones that regulate corporations.