Consider that Amazon is also mostly not profitable but has staggering amounts of positive free cash flow.
Do you know that for a fact?
https://www.bloomberg.com/news/articles/2016-06-14/dropbox-c...
https://www.wsj.com/articles/dropbox-ceo-were-cash-flow-posi...
https://techcrunch.com/2016/06/14/dropbox-says-it-is-cash-fl...
But I have not personally inspected their financial statements and conducted an audit to confirm this with my own two eyes, if that's what you're asking.
Consider that Amazon is also mostly not profitable but has staggering amounts of positive free cash flow.