In case you or others missed it, the parent commenter is quoting a comment that was posted on HN's original thread announcing Dropbox in 2007, where the poster

In case you or others missed it, the parent commenter is quoting a comment that was posted on HN's original thread announcing Dropbox in 2007, where the poster questioned if Dropbox would ever generate income. Hindsight is of course 20/20, but this comment is often laughed at because it was so terribly bad at predicting Dropbox's success.