On the seventh paragraph of the statement announcing its most recent earnings, WeWork offhandedly pointed out a problem: “Substantial doubt exists about the Company’s ability to continue as a going concern.” A look at the cash flow statement confirms it. WeWork burned $751 million in free cash in the last six months, and it only has $259 million in the bank. It has about two months of cash left. Losing money is nothing new to WeWork. The company has lost a cumulative $16.8 billion since it was set up. But the latest incarnation of WeWork is meant to be able…