Oh, I've used them! I just really don't think they're a startup by any definition. Founded in 1986, 30,000 employees, 1,000 locations.
And they aren't offering a benefit platform, they're running actual daycare locations. Their connection to employers is also most commonly providing "backup care", not solid day-to-day daycare. Nothing to sniff at of course, but that alone will not solve the problem for working parents.