Oster, an economist who has become a leading voice on millennial parenting, is taking her popular newsletter, ParentData, independent. In an email to subscribers on Friday morning, she said the relaunch “has been in the works for months.” The news comes as prominent writers like Casey Newton and Ryan Broderick have announced their departures from Substack after The Atlantic reported that a handful of openly Nazi newsletters have been allowed on the platform. Oster’s announcement did not reference the controversy.