Region limitations...as in DVD Region Coding is well and truly outside of 'our' control.
Games can be subject to similar distribution limitations...and in the case of censorship classifications causing the restriction they are again outside of 'the little people's' control.
Example. Australia does not have an adult classification for games...so...if something is deemed to be 'adult' in content then it will not be available to anyone, anywhere within Australia.
Anything with fascist/nazi content is prohibited in Germany....same deal....it's available in other countries.
Never confuse the Global nature of the Internet and it's seeming liberal intercourse with some ideal of Global touchy-feely free world market.