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.
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According to their Advertise page, UK is 7% of their audience. Their reaction looks like they care.
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.