Completely irrelevant whataboutism.
> is binance an american company? if not then why should it care about american sanctions?
I suspect you haven't an understanding of the long arm of Uncle Sam.
That's also not accurate, after all many countries in which they do business have sanctions against Iran. The EU for instance. The UN. [1,2]
But beyond that, I think you'll find that US' view of its jurisdiction includes any businesses that do business with Americans. Even if they pretend not to do business with Americans with a '.us' entity set up under the 'Tai Chi' [3] framework to attempt to evade regulators. Especially if they have a long history of looking the other way over VPNs.
[1] https://en.wikipedia.org/wiki/Sanctions_against_Iran#UN_sanc...
[2] https://www.consilium.europa.eu/en/policies/sanctions/iran/
[3] https://www.forbes.com/sites/michaeldelcastillo/2020/10/29/l...