Maybe they will say British citizens use it in foreign countries as their loophole. I don’t agree with it and I’m not a lawyer but I’m just predicting their argument.
They might care about lost advertising dollars, but the UK has no jurisdiction and judgements contrary to the constitution will not be recognized by US courts.
Their reaction puts on record the constitutional/legal barriers, preserves strategic optionality, and possibly preempts escalation that could still cause real headaches. It's strategic, not a sign that they actually think the UK has a case.
