" the fact still remains that Kim Dotcom made his fortune by providing a service that was used to circumvent paying for content."
Calling your opinion a fact , does not a fact make.
The fact would be that Kim Dotcom provided a service for file sharing, hosting and distribution. The files the clients of said service chose to share , host and distribute happened to contain content that they were not licensed to do so with. The clients are the criminals, not the provider of the service. This is the the technical and legal fact.
Since they can't prosecute a million people and possibly maintain their political office at the same time, the US (politicians and agencies) chose to go for the easiest and softest target in this case - namely , Kim Dotcom.
Why is he a soft target? He is a single identifiable individual, who is obese and rich from doing something that is borderline legal. The psychological impact of seeing a fat , pompous and rich man , who got that way doing something the common man is repeatedly told is a very very bad thing is rather irritating.
If you think there is even a shred of legality in the behavior of the US you are fooling yourself. Even if Kim Dotcom turned out to have facilitated crimes (which is debatable but may be alleged), the US did not stay within the law either. That just brings it down to a case of Might is Right. This is why this case should be an indicator to the US public that their system is going to the dogs.
"All murderers are punished unless they work in large numbers or to the sound of trumpets" - Voltaire. He said it best.