Dropbox has been touted as Y Combinator's most successful investment to date.
But to answer your question, yes, it turned a profit:
> The maker of cloud-based file-sharing software reported profit, excluding some costs, of 10 cents a share, above the 6 cent average estimate of analysts polled by Bloomberg.
So, not really then?
From the same article:
>The company also posted a narrower net loss of $7.7 million
Dropbox is still not profitable.
> Dropbox has demonstrated impressive growth since 2015, roughly doubling the number of paying users and revenue. Dropbox became cash-flow positive in 2016, but recorded a loss of $111 million that year after pouring money back into its product development efforts.