You are maybe half-joking but the only reason it has not happened yet is that the EU is actively promoting free trade. I don't know for other countries but on my case in France, people would happily block or put massive taxes on large American websites to create local equivalents, they only reason it's not done yet is because they can't with the EU. And it's not the United States either, you can't argue that keeping free trade is good for the economy since the general consensus is that free trade is bad and hurting the country.