They mention that Google offers their service cheaper. But not the fact that you can have your own personal terabyte cloud for a couple hundred bucks, one you personally own and control, and never have to pay a subscription for. That is what threatens Dropbox and friends the most. Once storage becomes cheap enough to price personal NAS clouds below $100 (and upstream bandwidth gets faster than molasses), why would anybody trust a DMCA/FISA-encumbered, subscription-based business with their data?