You might see that the Dropbox Community team have been busy working on some major updates to the Community itself! So, here is some info on what’s changed, what’s staying the same and what you can expect from the Dropbox Community overall.
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My guess would be that it's not a technical matter, it's that Apple are being extremely restrictive with terms as they want users to move to iCloud.
But Dropbox won't want to say that publicly and ruin any relationships.