[nacs]

That's pretty misleading. That article is judging what is written in the publicly stated privacy policy of each company.

EFF has in no way verified the privacy policy is actually honored or that back-doors aren't installed in the companies' datacenters.

[r3bl]

And let us not forget about the whole Drop Dropbox scenario which was very popular on HN at the time it was released: http://www.drop-dropbox.com

And that Dropbox was one of the companies in the whole PRISM scandal.

I still use it, mostly to transfer files between my devices, but there's no way I'm gonna be using it for anything sensitive. Everything sensitive goes to my organization's ownCloud installation which I completely trust since... well, I'm the one maintaining it.