Why shouldn't someone complain about a law, even if they already knew about it? The false dichotomy between "obey and complain" vs. "get caught and shut up" isn't necessary.
Because sometimes it's annoying and simply stupid.
Case in point: posting stupid reductionist arguments about "exporting math" are obnoxious and completely frivolous, especially when it literally ignores everything substantial about the law.
After all, if I give north korea blueprints for nuclear reactors, that's just paper right?! It's just math on paper! What, that's not the same? Sure it is - quit trying to stop me from exporting paper!
You do see how the grandparents point is obnoxious and stupid, right? Or do you not because it simply aligns with your worldview?