Gross margins here are irrelevant: if they can't charge a high enough price to cover all expenditures and rely on cash raised via fund-raises, they are not financially healthy.
Could they be one day? Maybe.
Yes they do need to grow margins to cover expenses, eventually when Amazon had to turn a profit.
My point was only that the numbers we do know clearly show a drop in growth rate of revenue, I can't judge numbers that aren't publicly known.