The stolen data was allegedly used in an attempt to blackmail Nintendo.
http://www.nintendoworldreport.com/news/25388
An unnamed man in Malaga, Spain was arrested for leaking stolen user data from Nintendo owners. It is unknown whether the data came from Nintendo's systems or a third party.
According to the Interior Ministry of Spain, the man obtained data on 4,000 Nintendo users and threatened Nintendo with a negligence report to Spain's data protection agency. When Nintendo did not respond, he began the data leak and intended to put the full user database online.
Nintendo could not give a comment on the situation due to the active investigation.
Whichever side is true, he still tried to blackmail Nintendo.That depends on the definition under Spanish law. For instance, US law stipulates that the person "demands or receives any money or other valuable thing." (http://www.law.cornell.edu/uscode/18/873.html)
Whichever side is true, he still tried to blackmail Nintendo.