They aren't the only US site doing this
It is doubly entertaining seeing this on sites which have a massive Eu exposure including local subsidiaries registered in a Eu country, contracts with Eu entities, etc - namely Accuweather.
It is only a matter of time until they sit on a lit petard though it will probably be served not by the ICO. It is toothless and it takes an act of god for it to enforce the GDPR. We will have to wait for the other, proper authorities. Some of the regional German ones and the Austrian comes to mind here.