US sanctions, even the threat thereof, are serious business. To this day, US nationals or US tax persons are having a really hard time finding a bank in Europe that is willing to deal with them because many banks don't want any exposure to the US FATCA they can avoid.
I had an ex-girlfriend who was born in Germany to US and Greek parents. Quite the shitshow with paperwork.
With the US, it feels like everything is much more uniform with the tie back to a federal social security number. The SSN is universally requested for many types of financial and insurance setups.
Lying on these forms is punishable under our AML/KYC regulations and exposes you to civil liability for damages.
Had friends working export compliance for a larger US IT company, and they once (temporarily) blocked a larger shipment to the (British) Royal Air Force because some bozo abbreviated them as "RAF" - which, obviously!, refers to the (German) Red Army Faction, a left-extremist terrorist cell that wasn't relevant for more than 10 years at that point (and wouldn't know what to do with high performance computers, anyway).
Better safe than sorry, otherwise you mess up one day, come back to the HQ on the next and all that's left is a brand new parking lot.
I don't know whether HN violates sanctions, but comparing to GitHub HN is very, very small fish. The chances that GitHub would swim under the radar were pretty slim.
Really, "this company obeys the law, so it is evil" is lame.