What is a burger? If it looks like a burger and tastes like a burger I'm fine with calling it a burger. Nobody complains about halloumi burgers. Why is "coconut milk" OK, but "soy milk" is not? Blood sausage has nothing similar with the regular sausage. Hey, there are people who put pineapple on dough and call it "pizza"[1]. I agree that industries should not be able to intentionally mislead people, but informing customers was not the primary motivation behind those laws - protecting existing monopolies was.

[1] Relax, I'm joking.