If a comparable number of Xboxes were compromised through a game on Microsoft's own Xbox store then I would say that's an Xbox hack. It'd mean that the malware

If a comparable number of Xboxes were compromised through a game on Microsoft's own Xbox store then I would say that's an Xbox hack. It'd mean that the malware evaded the Xbox's security mechanisms (which are implemented at Microsoft's end when publishing onto the store). For non-walled-garden platforms, like most desktop operating systems, a program being available for download isn't yet a bypass of any security feature. It'd have to do something forbidden like privilege escalation for me to count it as a OSX/Windows/Linux hack.