no it's not, because the internet doesn't require you to be present in some place so you are not subject to that jurisdiction. i do not recognize the jurisdiction of a country to demand a block of its citizens from a company located in an entirely different nation, and i doubt American courts would either.
like imagine i host a human rights site. if iran says it is illegal for me to provide access to content supporting womens rights to iranian citizens, it is not "illegal" for me to continue doing so because i am American, i live in America, and i operate only by American laws. America would not extradite me to iran for failing to comply with their internet rules.