The trouble with this is that if the US has a legitimate claim on him, then so does every other country in the world, since they're all on the Internet too. And it isn't reasonable for me to be on the Internet and be expected to comply with the laws of all the countries in the world all at once.
Or is there something specific apart from being on the Internet that gives the US some kind of special claim on him?
Only that US has this kind of extradition treaty with UK. But I assume US has it with many other countries, too.
Extradition should only happen for the most vicious of the crimes or for war crimes in my opinion, and it should go both ways. But extradition for copyright infringement? That's pretty ridiculous, especially when they have to extradite that country's own citizen.
Or is there something specific apart from being on the Internet that gives the US some kind of special claim on him?