Why is Dropbox shutting down Carousel and Mailbox?

Within the past week, I have received several mails from Dropbox intimating of their plans to shut down and Carousel (photo apps) and Mailbox (email) and I keep wondering why

That carousel email looks pretty self explanatory

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Pretty sad that Mailbox is shutting down. Still is the best mail app I have ever used.

I have now downloaded Boxer and Inbox by Google.

But with the rate at which standalone apps are being killed off (Facebook kills creative labs), Iā€™m not even sure anymore.