Motherhood is valorized in American culture because we don't want to admit the truth: we have built an entire economy on the backs of unpaid and poorly paid women.
And the issue with that from a sort of social mobility point of view is that a substantial proportion of those internships are unpaid and that effectively rules out those who can't afford to work for free.
For organizations that have struggled to keep the lights on due to the pandemic, this might mean thinking of non-financial ways to reward employees, like unpaid time off or flexible work schedules.