Even if all of the charges are true, these "crimes" would have taken place in the UK or where ever this person is living outside the US, so how then can the US justify charging them with violation of US law.
I know this is not the first time this has happened, nor will it be the last time this happens, but it is increasingly concerning that crimes completely committed online are open to US Jurisdiction and sets a TERRIBLE precedent.
As a US Citizen I do not want to be held to another nations laws, laws I may not be familiar with, because of my online activities.
It is only a matter of time before a EU nation attempts to extradite or arrest a US Citizen traveling abroad for a hate speech law violation or some other violation that occurred online from the US which is not a violation of US law but is a violation of EU Law.