It isn't equivalent to what they use now! How would a private cloud someone hacked together be as secure as the billions of dollars Google has poured into engineering elite, class-A data security?

Before someone accuses me of fanboying Google, recognize that (as I stated in a top level comment), Google as a company is probably one of the safest in the world for your data.

The only leg someone has to stand on in saying an open source alternative might trump Google is that the company willfully allows access to their data, bypassing the heavy security entirely. If you want to make that argument, fine, but you better have something else prepared aside from the NSA scandal regurgitation.