I am not extrapolating from American tax law at all I as an American citizen am in no way bound by German law For example If I put a website selling digital N

I am not extrapolating from American tax law at all I as an American citizen am in no way bound by German law For example If I put a website selling digital Nazi Merchandise, and a german citizen buys it, I am in no way violating the German ban on those things because I am not bound by german law, any attempt to enforce germen law upon me would quickly be squashed by American Courts as a violation of my free speech Now Germany can forbid it citzens from going to my site, it can attempt to have that site blocked from Germany, it can even prevent other german businesses from doing being with me (including credit card company as your example) but it can never compel me directly as I am not under their authority at all