I'm wondering the same thing, even though I'm certain the answer is "political or cultural authoritarianism." If a product sold challenges a demographic in power, even if it's minimal, that demographic will outlaw it immediately.
Example: article I saw yesterday about how Vietnamese gov told Steam to stop selling in their country because "the overwhelming library of games overshadows local devs" or something to that effect. The real reason is likely because of games that portray Vietnam in a bad light. From everything I've heard of the government there, the country is run by mobsters or similar.