This I don't understand. Mojang sells Minecraft in Sweden. You come to them, not the other way around (unless they have a US-based webshop).
A person from the US can fly to Sweden and buy a bottle of Absolute Absinthe (made-up) and then bring it back to the US. She may not succeed getting it through the customs, but it will be the US customs who enforce the import restriction, not the Swedish liquor store. Similarly, Mojang is a liquor store, Minecraft is a bottle. Why should Mojang be enforcing US e-com restrictions? This doesn't make any sense.