Obviously because Paramount claims those things are copyrightable to bolster their case. So, if that is actually true, they'd have to pay cause transporters and warp drives have been around since way before the Star Trek franchise.
The most funny thing of course is that when Erdogan was being charged with insulting some critics of his politics towards the kurds as being "wicked" and "sickening" he said there was free speech in his country. You can't make this up.
An "import" ban would be an order of magnitude more futile, because anyone outside the US publishing such open source code would not be covered by US regulations, so they couldn't be blocked from doing anything by a US court.