A year or so ago, there was a complaint from the NY Times (IIRC) that by asking about some event, they were able to get back one of their articles almost verbatim--and alleging that this was a copyright violation. This appears to be a similar outcome, where you do get back the verbatim text. That to me is a good reason to do tests like this, although feel free to do it with the WaPo or some other news outlet instead.