I know the context/reference, but still do not get it. It anyway assumes that Dropbox came up with something new, but it didn't - there were already such seamle

I know the context/reference, but still do not get it. It anyway assumes that Dropbox came up with something new, but it didn't - there were already such seamlessly integrated cloud storage providers with user friendly access, e.g. virtual new disk on Windows, tray icon, etc... The only thing Dropbox did differently seems like pure marketing.