To be honest, StarCraft is probably protected in most countries and don't believe that it is hard for Blizzard to find a local lawyer willing to take the case if the want to.
Please never take "not from the US so what" as a credible form of protection against any US actor, be it corporate or govermental.
There's many ways someone can still screw you, starting from making your travel to the US tricky to much worse, depending on the circumstances and what international agreements allow.
Blizzard can send a DMCA takedown to github and github must ASAP take down the repo regardless of if there was actual copyright infringement. I've seen github developers send DMCA requests to take down other developers repos before...