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.
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.
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.