Dropbox offers 1TB of storage for $10/mo (or $100/yr), and their "Carousel" app isn't terrible. And you get direct access to the damn files on all your devices (regardless of platform). It's a much better service than what Apple or Google offers for these reasons alone.

Yes, but for many, moving around hundreds of gigabytes of data is something that will take a day or two on their connection, which is enough of a barrier that they'll deal with crap instead.