Of course the exception to this that in some cases, when you are in jail you're not allowed to write books and make money off your crimes. Free speech would be you talking to someone about it, but you would not be allowed to detail the crime and make money from it.
The original question isn't about freedoms really, but more about ethics. The data is stolen. You shouldn't be looking at stolen data, or even pseudo-copies. We see with Snowden that even large media companies makes mistakes with release and redacted information (e.g. revealed ISIS current intel because they didn't properly block out a PowerPoint slide). Perhaps you'll feel differently when you see someone who's stolen your name, address, DOB, SSN, work history, history of living, interviews of friends, financial information and a trove of other information put out on the internet, and then have someone do "analysis" of your stolen information. No, this hasn't happened YET. But if the Guardian can do it with stolen documents from a business, there's no barrier to doing it with a person.