The irony of people saying essentially "Dropbox could have done this just by using open source tools" on hackernews, where people famously announced the Dropbox

The irony of people saying essentially "Dropbox could have done this just by using open source tools" on hackernews, where people famously announced the Dropbox would fail because it was easy to reproduce using open source tools entertains me. Maybe, just maybe, the engineers in question considered mature open source tools and decided they didn't serve their needs.