While I agree Wording is a bit vague but Dropbox describes themselves as "Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily. " they've added features API and app direct access but two way…
This means you can easily set up your own sync server to replace Dropbox, with unlimited storage and a low, one-time cost
If there is no two way sync how can this statement on the first page be true?
Marty