It's probably to avoid trouble with federal laws.

See also, the iTunes EULA forbids using it to develop nuclear, missile, chemical, or biological weapons

https://www.apple.com/legal/internet-services/itunes/us/term...

> g. You may not use or otherwise export or re-export the Licensed Application except as authorized by United States law and the laws of the jurisdiction in which the Licensed Application was obtained. In particular, but without limitation, the Licensed Application may not be exported or re-exported (a) into any U.S.-embargoed countries or (b) to anyone on the U.S. Treasury Department's Specially Designated Nationals List or the U.S. Department of Commerce Denied Persons List or Entity List. By using the Licensed Application, you represent and warrant that you are not located in any such country or on any such list. You also agree that you will not use these products for any purposes prohibited by United States law, including, without limitation, the development, design, manufacture, or production of nuclear, missile, or chemical or biological weapons.

Though it doesn't try to identify if the computer you're running it on is in a weapons lab and forbid playing music... yet