"VanGo: An on-demand ride service for getting your kids and teens around. The founders say that, because “moms trust other moms,” 85 percent of drivers on their service are moms and all of them are women." Is that legal?
It's probably not legal for them to use sex as a hiring criteria, but it's legal for “all women” to be the outcome if the actual criteria are both facially neutral and sufficiently narrowly linked to job functions. Judging from VanGo’s website, they require 3+ years of childcare experience, with references and clean background check; the childcare experience filter alone, given how female-dominated that field is, is likely to result in an overwhelmingly female potential employer pool, a d their may be further bias in who chooses to apply to VanGo.
Pushing the 85% moms thing (which VanGo does, unlike the all women thing, on their webpage) is potentially problematic ; if they are advertising it, they are likely inclined to favor it, which is illegal (even if it was parents, not “moms").