To answer the question at hand: "Why was [this] company able to raise $76 Million Series B?" They make money.
What's more concerning to me is that the coverage in TechCrunch and Business Insider wasn't able to raise a modicum of doubt. If googling "JustFab" returns "Class Action Lawsuit" in the first 5 results, it would seem that the reporters either didn't do the absolute minimum required for effective journalism, ignored it, or were instructed to ignore it.
We've all heard the "online journalism is broken" refrain, so I won't repeat it here.* I'll just note that if it's so far gone that googling the topic of interest is out of the question, this form of journalism is worse than I thought.
I respect you man. Not gonna argue with you. Just before the re-branding of Hotmail to Outlook, there was an article on TC, claiming it takes '14 seconds' for Gmail to load. And posts like that one are not rare on TC.