Is he the subject of an extradition proceeding? Otherwise, he is not a fugitive from justice here, and thus his GoFundMe is not aiding and abetting. Not that he isn't a scum for all his DDoS attacks.
You mean accomplice in the DDoS attack? If the DDoS could be proven as a crime in the US, then yes, the GoFundMe would be aiding and abetting. The underage part probably wouldn't make much difference, unless we're taking about something else