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Most businesses need to send files via sFTP for various reasons. I am not sure why Dropbox does not provide SSH as an option to upload and/or download files.
I will add... most companies want to automate file transfers as much as possible. sFTP is what makes this capability possible, especially from midrange systems like IBM i, IBM Power AIX and Mainframe systems...
If sFTP support was added, a company could trigger a script from an internal process to land in a desired DropBox folder. Or, if expecting files, the application could monitor the folder for any new files meeting 'xyz' criteria.