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"He [NZ Judge David Harvey] also confirmed that the charges in the indictment relating to money laundering, racketeering and wire fraud are not separate criminal acts but dependent on the claim of criminal secondary copyright infringement."

https://en.wikipedia.org/wiki/Megaupload_legal_case which links the actual legal documents

The fraud and racketeering charges are a sham, manufactured to work around the non-extraditable copyright infringement charges.

It's worth pointing out that such charges can stem from a pretty wide variety of actions. Look at Aaron Schwartz - he had access to JSTOR and tried to download all the files there. So they block his IP, and he spoofed his ID and tried again. They charged him with wire fraud for this.