According to crunchbase they're basically owned by a private equity firm now (which is rarely a fun place to be) and are raising something like a billion dollars a year -- which basically appears to be around what their operating costs are (employee count of that year * $250k/yr).
They're either not bringing in any real revenue, or growing at the rate of revenue. Multiple raises per year (of weirdly different values) indicate frequent requests for more money.
Are they growing or are they dying? Either way they aren't doing it through revenue, and they're not going public so the financials stay very hidden.