As a German, I gave up on online contests and giveaways if they are written in English. Luckily I have the ability to see from the language almost instantly if it is available here, but I’d imagine for an Australian or British person it would end up a lot harder.
Yeah, I'm Canadian and despite the short trip from the border we're usually ineligible for these things. It happens occasionally, but not terribly often. I just mentioned Australians because they'd be the more extreme case.
More frustrating is just google-searching for products and whatnot.
The author of this blog would find a very different functionality for his bot if he were located in, say, Australia.