Earlier quoted context omitted.
Hacker News about Dropbox (2007): "For a Linux user, you can already build such a system yourself quite trivially by getting an FTP account, mounting it locally with curlftpfs, and then using SVN or CVS on the mounted filesystem" Hacker News about Uber (2019): "It's really not much of a shift from a phone call either"
Hasn't Dropbox lost market value every quarter since they went public while growth has been flat and operating at a loss? I'm not saying the HN crowd didn't miss a $10B opportunity, but they also weren't exactly wrong.
Also, Dropbox was an early mover. That worked well for them in their early days, but the consumer space is saturated by better options. Dropbox (and Box) are often better suited to enterprise use, where some of the more advanced features (that regular consumers mostly don't care about) are important.