How can anyone possibly recommends draconian services like "Microsoft OneDrive" and "Google Drive" as alternatives for moving off Dropbox. This looks more about dropping Dropbox for the sake of dropping Dropbox, rather than anything else.
The hole campaign is a joke, they are blaming Dropbox for the crimes sanctioned by the citizen of the USA. Or do they really expect that a company like Dropbox cares about anything but money?
Anyway, they are missing one important alternative, seafile. Open source, encrypted and if you don't want to setup your own server you still get 1GB at seacloud for free.
Because Microsoft and Google are both much, much larger companies that have more than one business avenue, not to mention deeper pockets for lawyers.
When asked for a user's data, they are are far more likely to respond with 'fuck off' than a small single-business-model company with a known government war criminal on the board of directors.
Microsoft, Google, Facebook and Yahoo have no incentive to show their middle finger to the government.
As soon as your company receive a subpoena (or even a "national security letter" for that matter) from the government to hand over your users' data, the size of your company or your business model does not matter at all.
Don't hold your breath for Microsoft, Yahoo and Google to fight for your rights. The same goes for Dropbox. That is why suggesting to move from Dropbox to Microsoft/Google Drive does not make any sense.
Nothing that you do not control yourself can be considered secure. If you must use a 'cloud storage', consider it to tantamount to be 'in the public domain'. In other words, don't put anything in 'cloud storage' that you would not be happy seeing printed on the front page of the New York Times for all the world to see.
I would add BitTorrent Sync to the list. Yes, wait until they opensource the code, but once that happens it seems to be a better option than the businesses listed in the article.
