nothing to do with shipping and everything to do with compliance with local laws regarding prizes, lotteries, giveaways, etc.They only do US because it’s easier than international and they don’t have to do more money to ship them international. And MacRumors is in the US so that’s also why.
MacRumors Giveaways... Why are they only open to U.S. residents?
Why only US Residents? If you do that, then you can't argue over georestrictions. The internet has no borders and shipping is not that much nowadays...