It's funny: it reminds me of "strong cryptography export ban" in the 2000's (btw, Oracle java still have it: you must download strong crypto package separatly)... Obviously, it failed! You can stop a single vendor with unique technology to provide hardware components with bans, but you can't stop a whole field spreading knowledge!!! People come and go, meet, talk, write, exchange knowledges... so sooner or later (and…
I don't think the government actually wanted to stop math [1] from leaving the border. It was just a tool to use against people they suspected being involved espionage. Just another reason to put you in a cell. https://simple.wikipedia.org/wiki/RSA_algorithm
Thomas Sowell wrote a quite a few good books about this.
I have no doubt it applies equally to export laws.