The leaker is absolutely bonkers, holy shit.
Rockstar is a multi-billion dollar corporation and can get local authorities anywhere to take this guy down regardless of territory. Their HQ is in Ireland.
All in the last ~2 years mind you:
Ubisoft hacked - Hackers Walk (Legion source code hits the streets)
Nvidia hacked - Nvidia hacks back......Hackers Walk (LHR v2 exploit found in drivers, GPU roadmap leaks)
Microsoft hacked -Hackers Walk (Details are on a need to know basis)
CDP RED hacked - Hackers Walk (Source code hits the streets)
Crytek hacked - Hackers Walk (CryEngine source code hits the streets)
Note that the Microsoft and Nvidia hacks would have been a big deal because of government contracts and the like.